Nexus ProJoint Pre-Grout Stone & Porcelain Paving Sealer
About the product
Nexus ProJoint Pre-Grout is one of the best pre-grout sealers on the market — an invisible, water-based treatment for porcelain, natural stone and concrete paving, suitable for indoor and outdoor use. Applied before grouting, it creates a barrier that prevents grout haze, resin sheen, picture framing and staining. Dries completely invisible — no colour change to your paving.
Coverage: up to 15m² per litre on natural stone and up to 30m² per litre on porcelain. Apply 2 coats; ready for grouting in approximately 1 hour. Highly recommended before ProJoint TITAN and all resin or epoxy compounds. Available in 1L bottles (box of 12) or 5L tubs.
Download the technical datasheet (PDF) or call us on 0330 122 1025.
Nexus ProJoint Pre-Grout Stone & Porcelain Paving Sealer
For Highlands, Guernsey, Jersey, Isle of Man, and Isle of Wight – call 0330 122 1025.
For Highlands, Guernsey, Jersey, Isle of Man, and Isle of Wight – call 0330 122 1025.
About the product
Nexus ProJoint Pre-Grout is one of the best pre-grout sealers on the market — an invisible, water-based treatment for porcelain, natural stone and concrete paving, suitable for indoor and outdoor use. Applied before grouting, it creates a barrier that prevents grout haze, resin sheen, picture framing and staining. Dries completely invisible — no colour change to your paving.
Coverage: up to 15m² per litre on natural stone and up to 30m² per litre on porcelain. Apply 2 coats; ready for grouting in approximately 1 hour. Highly recommended before ProJoint TITAN and all resin or epoxy compounds. Available in 1L bottles (box of 12) or 5L tubs.
Download the technical datasheet (PDF) or call us on 0330 122 1025.
Nexus ProJoint Pre-Grout Sealer | Invisible Surface Protection Before Grouting Porcelain & Natural Stone Paving
ProJoint Pre-Grout is one of the best pre-grout sealers on the market — an excellent example of a product that does a quiet but critical job brilliantly. Applied before grouting, it creates an invisible barrier that lets jointing compounds release cleanly from the paving surface, dramatically reducing the risk of resin sheen, grout haze and staining. It also aids the workability of the jointing compound itself. It's a product our customers consistently come back to tell us they're delighted with: a small step that makes a big difference to the finished result.
Water-based, invisible pre-grout treatment for porcelain, natural stone and concrete paving — suitable for indoor and outdoor use, all year round. Up to 30m² per litre on porcelain; up to 15m² per litre on natural stone. Apply 2 coats; ready for grouting in 30–60 minutes. Compatible with all ProJoint grouting products including RapidFlow and TITAN.
We're a small, family-run business — I'm Cleo, the owner, with over 25 years in the construction industry working with businesses including Tarmac and Instarmac. I work alongside a team of incredibly knowledgeable and caring individuals, and between us we've seen a lot of grouting jobs go wrong because this step was skipped. Pre-Grout Sealer is the product we always recommend before any resin, epoxy or cementitious jointing compound — it's inexpensive insurance against an expensive and very visible problem.
If you're about to grout porcelain, natural stone or concrete paving — whether with ProJoint RapidFlow, TITAN, or any other ProJoint compound — Pre-Grout is the product we'd confidently apply first, every single time. Available in 1 litre bottles and 5 litre containers. Call us if you're unsure which size is right for your project.
Key Benefits
- Prevents grout haze and resin sheen — creates an invisible barrier that lets compounds release cleanly from the surface
- Professional strength pre-grout treatment — suitable for all types of porcelain, natural stone and concrete paving
- Aids workability — helps with the application of air cure, epoxy and cementitious grouts
- Completely invisible — dries with no colour change to paving slabs whatsoever
- Water-based and breathable — can be used all year round, safe for indoor and outdoor use
- Fast turnaround — ready for grouting in just 30–60 minutes (weather dependent)
- Excellent coverage — up to 30m² per litre on porcelain; up to 15m² per litre on natural stone or concrete
- Ideal for textured porcelain surfaces — where grout haze is hardest to remove
- Compatible with all ProJoint jointing products — highly recommended before TITAN, RapidFlow and epoxy compounds
- Dual use — can also be applied post-grouting (once fully cured) to protect paving and aid stain removal
- Available in 1L bottles and 5L containers
Technical Information
| System | Invisible water-based pre-grout sealer |
| Suitable for | Porcelain, natural stone, concrete — indoor and outdoor |
| Finish | Invisible — no colour change to paving |
| Coverage (porcelain) | Up to 30m² per litre / up to 150m² per 5L |
| Coverage (natural stone / concrete) | Up to 15m² per litre / up to 75m² per 5L |
| Recommended coats | 2 coats for maximum protection |
| Dry time between coats | Allow first coat to fully dry before applying second |
| Ready for grouting | 30–60 minutes after second coat (weather dependent) |
| Formula | Water-based, breathable |
| Pack sizes | 1L bottles or 5L containers |
| Compatible with | All ProJoint products — air cure, epoxy and cementitious grouts |
Preparation
Ensure the paving surface is sound, clean and free from dirt, dust and oil before application. For best results, apply onto a dry surface — allow at least two days after cleaning for all moisture to fully dissipate. The sealer can be applied to damp surfaces but performance will be slightly reduced. Apply when surface temperature allows for normal drying conditions.
Application Instructions
- Shake or stir the container well before use.
- Apply a complete, even first coat over the whole paving surface, removing any excess. Allow to dry fully before proceeding.
- Apply a second even coat and leave to cure — 30 to 60 minutes in normal conditions (weather dependent). An extra coat may be needed on particularly porous or textured paving.
- Once the sealer has dried, it is ready to accept foot traffic and your chosen jointing compound can be installed.
- For additional temporary protection, a further coat can be applied immediately before grouting begins on highly textured surfaces.
- Clean all tools and equipment with water after use.
Important: Always test in a hidden area before full application. The sealer is designed to be invisible but may very slightly darken extremely light or highly porous surfaces. Do not discharge waste into drains or watercourses.
For a longer-lasting permanent seal once the Pre-Grout Sealer has faded, we recommend ProJoint PRO-820 ECO Invisible Water-Based Sealer.
Frequently Asked Questions
I'm Cleo, owner of The Paving Experts, with over 25 years in the construction industry working with businesses including Tarmac and Instarmac. I work alongside a small team of incredibly knowledgeable and caring individuals who share the same passion for getting it right. The FAQ answers below come from the questions we're asked every single day.
Why should I use Pre-Grout Sealer?
The sealer assists in preventing resin sheen and grout haze. It also helps with the workability of jointing compounds — including air cure, epoxy and cementitious grouts. Skipping this step is one of the most common causes of a disappointing finish after grouting.
How long until the sealer is cured and ready for grouting?
As soon as the sealer has dried — 30 to 60 minutes weather dependent — it is ready to accept foot traffic and your chosen jointing compound.
Is the sealer water or solvent based?
This sealer uses a water-based formula, allowing it to be used all year round without the hazards associated with solvent-based products.
Does the area need to be dry before application?
For best results, apply onto a dry surface. However, the sealer can be used if surfaces are damp — performance will be slightly reduced on very wet surfaces.
How many coats do I need to apply?
We recommend 2 coats for maximum protection. You must wait for the first coat to dry fully before applying the second. On highly textured or porous paving, an additional coat may be applied immediately before grouting.
What is the coverage rate?
1 litre covers up to 15m² on natural stone and up to 30m² on porcelain. A 5 litre container covers up to 75m² on stone and up to 150m² on porcelain.
Will it change the look of my paving?
No — it dries completely invisible with no change to colour or texture. We always recommend testing in a small hidden area first, particularly on very light or highly porous surfaces.
Which jointing products is it compatible with?
All ProJoint products — it is particularly recommended before RapidFlow, TITAN, Flowpoint Natural Grey, Flowpoint Fine Natural Grey, Porcelpoint, Larsen FJM, FUGA-PAVE FLEX XP and TileJam. Also suitable for use before leading cementitious grouts.
Can it be used after grouting too?
Yes — once grouting is complete and fully cured, a coat of Pre-Grout Sealer can be applied to protect the paving surface and aid future removal of stains and dirt from organic matter.
Need Some Help?
Get in touch or call us on 0330 122 1025 — we're always happy to help.
- Brand: Nexus
- Product Type: Temporary Paving Sealer
- SKU: TPE-NEXPAVSTO368
- Weight: 12.0 kg / 26.46 lb
Delivery & Returns Info
Our delivery charges are calculated based on the size and weight of your order. When you add items to your basket, the delivery charges are displayed. Small orders are distributed via courier; larger orders via Pallet Network. Collection is available from our Tamworth depot by request (contact us first to arrange on 0330 122 1025).
Please note, there is a slight surcharge for areas that are outside of our locality, charges calculated at checkout.
| Weight and size | Next Working Day* Order before 1PM (excl. VAT) |
Standard 3-5 Working Day (excl. VAT) |
|---|---|---|
| 0-13KG (1 small bag/tub) |
£14.00 | £9.00 |
| 13.01-25KG (1 large bag/tub) |
£16.00 | £10.00 |
| 25.01-50KG (2 bags/tubs) |
£26.00 | £19.00 |
| 50.01-75KG (3 bags/tubs) |
£36.00 | £28.00 |
| 75.01-100KG (4-5 bags/tubs) |
£46.00 | £37.00 |
| 100.01-249KG (6-9 bags/tubs) |
£60.00 | £45.00 |
| 249.01-750KG (10 bags plus) |
£68.00 | £48.00 |
| 750.01KG plus (30 bags plus) |
£75.00 | £55.00 |
| Full Pallets (56 bags/52 tubs) |
£88.00 | Free of charge |
| Next Working Day delivery (Premium 1-2 Working Day Service) | +avg. £5-10 Extra. Click here for prices |
|---|---|
| Scotland Delivery Service (Deliveries into some parts of Scotland can take 8-10 working days) | Click here for prices |
| Local Delivery & Click & Collect: | Email: orders@thepavingexperts.co.uk |
Delivery Information
- Prices apply to mainland England and Wales. Scottish delivery slight surcharge.
- Orders are packed and dispatched Monday–Friday (excluding weekends & public holidays).
Next Working Day Delivery
- Order before 1PM → same-day dispatch.
- Order after 1PM or on weekends/bank holidays → next working day dispatch.
- You'll receive tracking updates via email/SMS if you provide your details.
Delivery Examples
- Mon before 1PM → Packed Mon, delivered Tue.
- Mon after 1PM → Packed Tues delivered Wed.
- Fri before 1PM → Packed Fri, delivered Mon.
- Fri after 1PM/weekend → Packed Mon, delivered Tues (or Wed after a bank holiday).
- Standard Service: 3–5 working days.
Notes
- Occasional delays due to manufacturing, supply, or courier issues may happen, but we'll keep you informed.
Returns, cancel up to 14 days from date of delivery. Product to be returned in the same condition & packaging. No returns for cementitious & perishable products. You are responsible for the cost of returning goods to The Paving Experts, 20% admin restock fee applies. Need further info, click here.
For further detailed delivery information click here →
For any advice; technical, product, stock or quantity needed, call our team on 0330 122 1025.
Please see our FAQs for more information.
Nexus ProJoint Pre-Grout Sealer | Invisible Surface Protection Before Grouting Porcelain & Natural Stone Paving
ProJoint Pre-Grout is one of the best pre-grout sealers on the market — an excellent example of a product that does a quiet but critical job brilliantly. Applied before grouting, it creates an invisible barrier that lets jointing compounds release cleanly from the paving surface, dramatically reducing the risk of resin sheen, grout haze and staining. It also aids the workability of the jointing compound itself. It's a product our customers consistently come back to tell us they're delighted with: a small step that makes a big difference to the finished result.
Water-based, invisible pre-grout treatment for porcelain, natural stone and concrete paving — suitable for indoor and outdoor use, all year round. Up to 30m² per litre on porcelain; up to 15m² per litre on natural stone. Apply 2 coats; ready for grouting in 30–60 minutes. Compatible with all ProJoint grouting products including RapidFlow and TITAN.
We're a small, family-run business — I'm Cleo, the owner, with over 25 years in the construction industry working with businesses including Tarmac and Instarmac. I work alongside a team of incredibly knowledgeable and caring individuals, and between us we've seen a lot of grouting jobs go wrong because this step was skipped. Pre-Grout Sealer is the product we always recommend before any resin, epoxy or cementitious jointing compound — it's inexpensive insurance against an expensive and very visible problem.
If you're about to grout porcelain, natural stone or concrete paving — whether with ProJoint RapidFlow, TITAN, or any other ProJoint compound — Pre-Grout is the product we'd confidently apply first, every single time. Available in 1 litre bottles and 5 litre containers. Call us if you're unsure which size is right for your project.
Key Benefits
- Prevents grout haze and resin sheen — creates an invisible barrier that lets compounds release cleanly from the surface
- Professional strength pre-grout treatment — suitable for all types of porcelain, natural stone and concrete paving
- Aids workability — helps with the application of air cure, epoxy and cementitious grouts
- Completely invisible — dries with no colour change to paving slabs whatsoever
- Water-based and breathable — can be used all year round, safe for indoor and outdoor use
- Fast turnaround — ready for grouting in just 30–60 minutes (weather dependent)
- Excellent coverage — up to 30m² per litre on porcelain; up to 15m² per litre on natural stone or concrete
- Ideal for textured porcelain surfaces — where grout haze is hardest to remove
- Compatible with all ProJoint jointing products — highly recommended before TITAN, RapidFlow and epoxy compounds
- Dual use — can also be applied post-grouting (once fully cured) to protect paving and aid stain removal
- Available in 1L bottles and 5L containers
Technical Information
| System | Invisible water-based pre-grout sealer |
| Suitable for | Porcelain, natural stone, concrete — indoor and outdoor |
| Finish | Invisible — no colour change to paving |
| Coverage (porcelain) | Up to 30m² per litre / up to 150m² per 5L |
| Coverage (natural stone / concrete) | Up to 15m² per litre / up to 75m² per 5L |
| Recommended coats | 2 coats for maximum protection |
| Dry time between coats | Allow first coat to fully dry before applying second |
| Ready for grouting | 30–60 minutes after second coat (weather dependent) |
| Formula | Water-based, breathable |
| Pack sizes | 1L bottles or 5L containers |
| Compatible with | All ProJoint products — air cure, epoxy and cementitious grouts |
Preparation
Ensure the paving surface is sound, clean and free from dirt, dust and oil before application. For best results, apply onto a dry surface — allow at least two days after cleaning for all moisture to fully dissipate. The sealer can be applied to damp surfaces but performance will be slightly reduced. Apply when surface temperature allows for normal drying conditions.
Application Instructions
- Shake or stir the container well before use.
- Apply a complete, even first coat over the whole paving surface, removing any excess. Allow to dry fully before proceeding.
- Apply a second even coat and leave to cure — 30 to 60 minutes in normal conditions (weather dependent). An extra coat may be needed on particularly porous or textured paving.
- Once the sealer has dried, it is ready to accept foot traffic and your chosen jointing compound can be installed.
- For additional temporary protection, a further coat can be applied immediately before grouting begins on highly textured surfaces.
- Clean all tools and equipment with water after use.
Important: Always test in a hidden area before full application. The sealer is designed to be invisible but may very slightly darken extremely light or highly porous surfaces. Do not discharge waste into drains or watercourses.
For a longer-lasting permanent seal once the Pre-Grout Sealer has faded, we recommend ProJoint PRO-820 ECO Invisible Water-Based Sealer.
Frequently Asked Questions
I'm Cleo, owner of The Paving Experts, with over 25 years in the construction industry working with businesses including Tarmac and Instarmac. I work alongside a small team of incredibly knowledgeable and caring individuals who share the same passion for getting it right. The FAQ answers below come from the questions we're asked every single day.
Why should I use Pre-Grout Sealer?
The sealer assists in preventing resin sheen and grout haze. It also helps with the workability of jointing compounds — including air cure, epoxy and cementitious grouts. Skipping this step is one of the most common causes of a disappointing finish after grouting.
How long until the sealer is cured and ready for grouting?
As soon as the sealer has dried — 30 to 60 minutes weather dependent — it is ready to accept foot traffic and your chosen jointing compound.
Is the sealer water or solvent based?
This sealer uses a water-based formula, allowing it to be used all year round without the hazards associated with solvent-based products.
Does the area need to be dry before application?
For best results, apply onto a dry surface. However, the sealer can be used if surfaces are damp — performance will be slightly reduced on very wet surfaces.
How many coats do I need to apply?
We recommend 2 coats for maximum protection. You must wait for the first coat to dry fully before applying the second. On highly textured or porous paving, an additional coat may be applied immediately before grouting.
What is the coverage rate?
1 litre covers up to 15m² on natural stone and up to 30m² on porcelain. A 5 litre container covers up to 75m² on stone and up to 150m² on porcelain.
Will it change the look of my paving?
No — it dries completely invisible with no change to colour or texture. We always recommend testing in a small hidden area first, particularly on very light or highly porous surfaces.
Which jointing products is it compatible with?
All ProJoint products — it is particularly recommended before RapidFlow, TITAN, Flowpoint Natural Grey, Flowpoint Fine Natural Grey, Porcelpoint, Larsen FJM, FUGA-PAVE FLEX XP and TileJam. Also suitable for use before leading cementitious grouts.
Can it be used after grouting too?
Yes — once grouting is complete and fully cured, a coat of Pre-Grout Sealer can be applied to protect the paving surface and aid future removal of stains and dirt from organic matter.
Need Some Help?
Get in touch or call us on 0330 122 1025 — we're always happy to help.
Technical Information
| System | Invisible water-based pre-grout sealer for porcelain, natural stone and concrete paving |
| Suitable for | Indoor and outdoor use |
| Finish | Invisible — no colour change to paving surface |
| Coverage (natural stone / concrete) | Up to 15m² per litre; up to 75m² per 5L tub |
| Coverage (porcelain) | Up to 30m² per litre; up to 150m² per 5L tub |
| Recommended coats | 2 coats for maximum protection |
| Dry time between coats | 30 minutes (weather dependent) |
| Walk-on / ready for grouting | Immediately once dry; approximately 1 hour after second coat |
| Application temperature | Between 5°C and 25°C surface temperature |
| Formula | Water-based, breathable |
| Shelf life | 12 months from date of manufacture |
| Pack sizes | 1L bottles (box of 12) or 5L tubs |
| Compatible with | All ProJoint jointing products; Flowpoint; Larsen FJM and other cement-based grouts |
Application Instructions
Paving should be sound, clean and free from dirt, dust and oil. Surfaces can be damp prior to application, but a better seal is achieved on a dry surface. We recommend cleaning with Nexus Paving & Driveway Cleaner prior to application and leaving to dry for at least two days — it is important that all moisture within the paving has fully dissipated before sealing.
The sealer is supplied ready for use. Apply when the surface temperature is between 5°C and 25°C — as a guide, the stone should be cool to the touch. Shake the container well before use. Application may be made by brush, roller or spray (wear appropriate PPE when spraying).
- Apply a complete, even first coat over the whole surface, ensuring any excess is removed. Allow to dry for 30 minutes.
- Apply a second even coat and leave to cure. Dependent on temperature, the second coat should be fully cured in approximately 1 hour. An extra coat may be required on particularly porous paving.
- Once the sealer has fully cured, the paving can be grouted or pointed. For additional temporary grout protection, a final coat can be applied immediately before grouting.
Clean all tools and equipment thoroughly with water after use.
Important: Always test in a hidden area prior to full application and only proceed when satisfied with the results. The Pre-Grout Sealer is designed as an invisible coating but may darken very light surfaces slightly. Do not discharge waste into drains or rivers.
For a longer-lasting seal once the Pre-Grout sealer has faded, we recommend ProJoint PRO-820 ECO Invisible Water-Based Sealer.
Delivery & Returns Info
Our delivery charges are calculated based on the size and weight of your order. When you add items to your basket, the delivery charges are displayed. Small orders are distributed via courier; larger orders via Pallet Network. Collection is available from our Tamworth depot by request (contact us first to arrange on 0330 122 1025).
Please note, there is a slight surcharge for areas that are outside of our locality, charges calculated at checkout.
| Weight and size | Next Working Day* Order before 1PM (excl. VAT) |
Standard 3-5 Working Day (excl. VAT) |
|---|---|---|
| 0-13KG (1 small bag/tub) |
£14.00 | £9.00 |
| 13.01-25KG (1 large bag/tub) |
£16.00 | £10.00 |
| 25.01-50KG (2 bags/tubs) |
£26.00 | £19.00 |
| 50.01-75KG (3 bags/tubs) |
£36.00 | £28.00 |
| 75.01-100KG (4-5 bags/tubs) |
£46.00 | £37.00 |
| 100.01-249KG (6-9 bags/tubs) |
£60.00 | £45.00 |
| 249.01-750KG (10 bags plus) |
£68.00 | £48.00 |
| 750.01KG plus (30 bags plus) |
£75.00 | £55.00 |
| Full Pallets (56 bags/52 tubs) |
£88.00 | Free of charge |
| Next Working Day delivery (Premium 1-2 Working Day Service) | +avg. £5-10 Extra. Click here for prices |
|---|---|
| Scotland Delivery Service (Deliveries into some parts of Scotland can take 8-10 working days) | Click here for prices |
| Local Delivery & Click & Collect: | Email: orders@thepavingexperts.co.uk |
Delivery Information
- Prices apply to mainland England and Wales. Scottish delivery slight surcharge.
- Orders are packed and dispatched Monday–Friday (excluding weekends & public holidays).
Next Working Day Delivery
- Order before 1PM → same-day dispatch.
- Order after 1PM or on weekends/bank holidays → next working day dispatch.
- You'll receive tracking updates via email/SMS if you provide your details.
Delivery Examples
- Mon before 1PM → Packed Mon, delivered Tue.
- Mon after 1PM → Packed Tues delivered Wed.
- Fri before 1PM → Packed Fri, delivered Mon.
- Fri after 1PM/weekend → Packed Mon, delivered Tues (or Wed after a bank holiday).
- Standard Service: 3–5 working days.
Notes
- Occasional delays due to manufacturing, supply, or courier issues may happen, but we'll keep you informed.
Returns, cancel up to 14 days from date of delivery. Product to be returned in the same condition & packaging. No returns for cementitious & perishable products. You are responsible for the cost of returning goods to The Paving Experts, 20% admin restock fee applies. Need further info, click here.
For further detailed delivery information click here →
Nexus ProJoint Pre-Grout Sealer | Invisible Surface Protection Before Grouting Porcelain & Natural Stone Paving
ProJoint Pre-Grout is one of the best pre-grout sealers on the market — an excellent example of a product that does a quiet but critical job brilliantly. Applied before grouting, it creates an invisible barrier that lets jointing compounds release cleanly from the paving surface, dramatically reducing the risk of resin sheen, grout haze and staining. It also aids the workability of the jointing compound itself. It's a product our customers consistently come back to tell us they're delighted with: a small step that makes a big difference to the finished result.
Water-based, invisible pre-grout treatment for porcelain, natural stone and concrete paving — suitable for indoor and outdoor use, all year round. Up to 30m² per litre on porcelain; up to 15m² per litre on natural stone. Apply 2 coats; ready for grouting in 30–60 minutes. Compatible with all ProJoint grouting products including RapidFlow and TITAN.
We're a small, family-run business — I'm Cleo, the owner, with over 25 years in the construction industry working with businesses including Tarmac and Instarmac. I work alongside a team of incredibly knowledgeable and caring individuals, and between us we've seen a lot of grouting jobs go wrong because this step was skipped. Pre-Grout Sealer is the product we always recommend before any resin, epoxy or cementitious jointing compound — it's inexpensive insurance against an expensive and very visible problem.
If you're about to grout porcelain, natural stone or concrete paving — whether with ProJoint RapidFlow, TITAN, or any other ProJoint compound — Pre-Grout is the product we'd confidently apply first, every single time. Available in 1 litre bottles and 5 litre containers. Call us if you're unsure which size is right for your project.
Key Benefits
- Prevents grout haze and resin sheen — creates an invisible barrier that lets compounds release cleanly from the surface
- Professional strength pre-grout treatment — suitable for all types of porcelain, natural stone and concrete paving
- Aids workability — helps with the application of air cure, epoxy and cementitious grouts
- Completely invisible — dries with no colour change to paving slabs whatsoever
- Water-based and breathable — can be used all year round, safe for indoor and outdoor use
- Fast turnaround — ready for grouting in just 30–60 minutes (weather dependent)
- Excellent coverage — up to 30m² per litre on porcelain; up to 15m² per litre on natural stone or concrete
- Ideal for textured porcelain surfaces — where grout haze is hardest to remove
- Compatible with all ProJoint jointing products — highly recommended before TITAN, RapidFlow and epoxy compounds
- Dual use — can also be applied post-grouting (once fully cured) to protect paving and aid stain removal
- Available in 1L bottles and 5L containers
Technical Information
| System | Invisible water-based pre-grout sealer |
| Suitable for | Porcelain, natural stone, concrete — indoor and outdoor |
| Finish | Invisible — no colour change to paving |
| Coverage (porcelain) | Up to 30m² per litre / up to 150m² per 5L |
| Coverage (natural stone / concrete) | Up to 15m² per litre / up to 75m² per 5L |
| Recommended coats | 2 coats for maximum protection |
| Dry time between coats | Allow first coat to fully dry before applying second |
| Ready for grouting | 30–60 minutes after second coat (weather dependent) |
| Formula | Water-based, breathable |
| Pack sizes | 1L bottles or 5L containers |
| Compatible with | All ProJoint products — air cure, epoxy and cementitious grouts |
Preparation
Ensure the paving surface is sound, clean and free from dirt, dust and oil before application. For best results, apply onto a dry surface — allow at least two days after cleaning for all moisture to fully dissipate. The sealer can be applied to damp surfaces but performance will be slightly reduced. Apply when surface temperature allows for normal drying conditions.
Application Instructions
- Shake or stir the container well before use.
- Apply a complete, even first coat over the whole paving surface, removing any excess. Allow to dry fully before proceeding.
- Apply a second even coat and leave to cure — 30 to 60 minutes in normal conditions (weather dependent). An extra coat may be needed on particularly porous or textured paving.
- Once the sealer has dried, it is ready to accept foot traffic and your chosen jointing compound can be installed.
- For additional temporary protection, a further coat can be applied immediately before grouting begins on highly textured surfaces.
- Clean all tools and equipment with water after use.
Important: Always test in a hidden area before full application. The sealer is designed to be invisible but may very slightly darken extremely light or highly porous surfaces. Do not discharge waste into drains or watercourses.
For a longer-lasting permanent seal once the Pre-Grout Sealer has faded, we recommend ProJoint PRO-820 ECO Invisible Water-Based Sealer.
Frequently Asked Questions
I'm Cleo, owner of The Paving Experts, with over 25 years in the construction industry working with businesses including Tarmac and Instarmac. I work alongside a small team of incredibly knowledgeable and caring individuals who share the same passion for getting it right. The FAQ answers below come from the questions we're asked every single day.
Why should I use Pre-Grout Sealer?
The sealer assists in preventing resin sheen and grout haze. It also helps with the workability of jointing compounds — including air cure, epoxy and cementitious grouts. Skipping this step is one of the most common causes of a disappointing finish after grouting.
How long until the sealer is cured and ready for grouting?
As soon as the sealer has dried — 30 to 60 minutes weather dependent — it is ready to accept foot traffic and your chosen jointing compound.
Is the sealer water or solvent based?
This sealer uses a water-based formula, allowing it to be used all year round without the hazards associated with solvent-based products.
Does the area need to be dry before application?
For best results, apply onto a dry surface. However, the sealer can be used if surfaces are damp — performance will be slightly reduced on very wet surfaces.
How many coats do I need to apply?
We recommend 2 coats for maximum protection. You must wait for the first coat to dry fully before applying the second. On highly textured or porous paving, an additional coat may be applied immediately before grouting.
What is the coverage rate?
1 litre covers up to 15m² on natural stone and up to 30m² on porcelain. A 5 litre container covers up to 75m² on stone and up to 150m² on porcelain.
Will it change the look of my paving?
No — it dries completely invisible with no change to colour or texture. We always recommend testing in a small hidden area first, particularly on very light or highly porous surfaces.
Which jointing products is it compatible with?
All ProJoint products — it is particularly recommended before RapidFlow, TITAN, Flowpoint Natural Grey, Flowpoint Fine Natural Grey, Porcelpoint, Larsen FJM, FUGA-PAVE FLEX XP and TileJam. Also suitable for use before leading cementitious grouts.
Can it be used after grouting too?
Yes — once grouting is complete and fully cured, a coat of Pre-Grout Sealer can be applied to protect the paving surface and aid future removal of stains and dirt from organic matter.
Need Some Help?
Get in touch or call us on 0330 122 1025 — we're always happy to help.
Technical Information
| System | Invisible water-based pre-grout sealer for porcelain, natural stone and concrete paving |
| Suitable for | Indoor and outdoor use |
| Finish | Invisible — no colour change to paving surface |
| Coverage (natural stone / concrete) | Up to 15m² per litre; up to 75m² per 5L tub |
| Coverage (porcelain) | Up to 30m² per litre; up to 150m² per 5L tub |
| Recommended coats | 2 coats for maximum protection |
| Dry time between coats | 30 minutes (weather dependent) |
| Walk-on / ready for grouting | Immediately once dry; approximately 1 hour after second coat |
| Application temperature | Between 5°C and 25°C surface temperature |
| Formula | Water-based, breathable |
| Shelf life | 12 months from date of manufacture |
| Pack sizes | 1L bottles (box of 12) or 5L tubs |
| Compatible with | All ProJoint jointing products; Flowpoint; Larsen FJM and other cement-based grouts |
Delivery & Returns Info
Our delivery charges are calculated based on the size and weight of your order. When you add items to your basket, the delivery charges are displayed. Small orders are distributed via courier; larger orders via Pallet Network. Collection is available from our Tamworth depot by request (contact us first to arrange on 0330 122 1025).
Please note, there is a slight surcharge for areas that are outside of our locality, charges calculated at checkout.
| Weight and size | Next Working Day* Order before 1PM (excl. VAT) |
Standard 3-5 Working Day (excl. VAT) |
|---|---|---|
| 0-13KG (1 small bag/tub) |
£14.00 | £9.00 |
| 13.01-25KG (1 large bag/tub) |
£16.00 | £10.00 |
| 25.01-50KG (2 bags/tubs) |
£26.00 | £19.00 |
| 50.01-75KG (3 bags/tubs) |
£36.00 | £28.00 |
| 75.01-100KG (4-5 bags/tubs) |
£46.00 | £37.00 |
| 100.01-249KG (6-9 bags/tubs) |
£60.00 | £45.00 |
| 249.01-750KG (10 bags plus) |
£68.00 | £48.00 |
| 750.01KG plus (30 bags plus) |
£75.00 | £55.00 |
| Full Pallets (56 bags/52 tubs) |
£88.00 | Free of charge |
| Next Working Day delivery (Premium 1-2 Working Day Service) | +avg. £5-10 Extra. Click here for prices |
|---|---|
| Scotland Delivery Service (Deliveries into some parts of Scotland can take 8-10 working days) | Click here for prices |
| Local Delivery & Click & Collect: | Email: orders@thepavingexperts.co.uk |
Delivery Information
- Prices apply to mainland England and Wales. Scottish delivery slight surcharge.
- Orders are packed and dispatched Monday–Friday (excluding weekends & public holidays).
Next Working Day Delivery
- Order before 1PM → same-day dispatch.
- Order after 1PM or on weekends/bank holidays → next working day dispatch.
- You'll receive tracking updates via email/SMS if you provide your details.
Delivery Examples
- Mon before 1PM → Packed Mon, delivered Tue.
- Mon after 1PM → Packed Tues delivered Wed.
- Fri before 1PM → Packed Fri, delivered Mon.
- Fri after 1PM/weekend → Packed Mon, delivered Tues (or Wed after a bank holiday).
- Standard Service: 3–5 working days.
Notes
- Occasional delays due to manufacturing, supply, or courier issues may happen, but we'll keep you informed.
Returns, cancel up to 14 days from date of delivery. Product to be returned in the same condition & packaging. No returns for cementitious & perishable products. You are responsible for the cost of returning goods to The Paving Experts, 20% admin restock fee applies. Need further info, click here.
For further detailed delivery information click here →
Application Instructions
Paving should be sound, clean and free from dirt, dust and oil. Surfaces can be damp prior to application, but a better seal is achieved on a dry surface. We recommend cleaning with Nexus Paving & Driveway Cleaner prior to application and leaving to dry for at least two days — it is important that all moisture within the paving has fully dissipated before sealing.
The sealer is supplied ready for use. Apply when the surface temperature is between 5°C and 25°C — as a guide, the stone should be cool to the touch. Shake the container well before use. Application may be made by brush, roller or spray (wear appropriate PPE when spraying).
- Apply a complete, even first coat over the whole surface, ensuring any excess is removed. Allow to dry for 30 minutes.
- Apply a second even coat and leave to cure. Dependent on temperature, the second coat should be fully cured in approximately 1 hour. An extra coat may be required on particularly porous paving.
- Once the sealer has fully cured, the paving can be grouted or pointed. For additional temporary grout protection, a final coat can be applied immediately before grouting.
Clean all tools and equipment thoroughly with water after use.
Important: Always test in a hidden area prior to full application and only proceed when satisfied with the results. The Pre-Grout Sealer is designed as an invisible coating but may darken very light surfaces slightly. Do not discharge waste into drains or rivers.
For a longer-lasting seal once the Pre-Grout sealer has faded, we recommend ProJoint PRO-820 ECO Invisible Water-Based Sealer.