ProJoint Titan FAQs

It’s not always necessary to pre-seal pavers when using ProJoint Titan epoxy grout. However, with porous stones or textured surfaces, pre-sealing is highly recommended.

When to pre-seal

Porous natural stone – sandstone, limestone, and some granites may absorb resin, causing staining.
Textured or riven surfaces – they can trap excess grout, making cleaning difficult.
Lightly coloured or polished stones – pre-sealing will prevent potential discolouration from resin residues.

When pre-sealing may not be needed

Non-porous or dense stones – some granites, basalts and quartzites are less likely to absorb resin.
Smooth, non-absorbent concrete slabs – these pavers usually clean easily without sealing.

If you’re in doubt, apply the grout to a small test area first. 

Regardless of the type of stone you’re using, and if you’re new to laying paving, you may still want to use a pre-grout sealant such as ProJoint Pre-Grout Stone & Porcelain Sealer that washes away quickly after applying.

Before applying ProJoint Titan, you must ensure that:

• Paving is firmly bedded and stable, and laid on bedding mortar suitable for the weight you expect to use the area for (up to a maximum of 10 tonnes). We also recommend using a quality paving primer.
• The bedding mortar is appropriate for the area’s intended drainage (either permeable or non-permeable mortars can be used with ProJoint Titan).
• Any soil or dirt is removed from the paving surfaces and joints – take care not to walk any dirt onto the area during application to avoid it getting trapped into the resin.
• If a pre-grout sealer is required, this has been applied. A sealant is recommended for porous and textured surfaces – see the advice above for more details.

While the slight resin sheen from ProJoint Titan can highlight the natural colours and hues of the stone, you may prefer to limit the amount of sheen that forms.

There are a few ways you can do:

• Before grouting apply a sealant, such as ProJoint Pre-Grout Sealant, to create a barrier and prevent the epoxy penetrating the paving surface. This particular pre-grout sealant washes away after application. 
• Surfaces must be adequately prepped and soaked with clean water before applying the grout.
• When removing excess grout, use a wet medium/soft brush  or squeegee at a 45º angle to the joints. Ensure no sand is left on the paving surfaces.
• It’s best to only apply the grout when the temperature is between 5°C and 20°C, and always keep the slabs misted with water. The optimum temperature is 15–20ºC. If the stone surfaces are too warm, particularly on darker slabs, the grout will cure much faster and create a challenge for keeping the surfaces wet. 
• Never apply the grout if the temperature is above 20°C – the surface temperature could be up to 40°C, causing the grout to set too quickly on the slabs and making it difficult to remove.
• Avoid applying during colder weather. Cold temperatures increase the curing time, which increases exposure to moisture and can contribute to amine blush (hazy residue).

ProJoint Titan can be applied at temperatures from 3ºC and rising, and up to 25ºC. However, for the best results, warmer temperatures of 15ºC and above are ideal – but at a maximum of 20ºC.

As a rule of thumb, avoid applying the epoxy grout during very cold or frosty conditions. Cold weather affects curing times and can increase the risks of water damage and amine blush (hazy residue).

Prolonged and heavy rain will delay the curing process and can risk spoiling the formula if it has not fully cured.

It’s best to delay applying the grout for a clear day. If there is a chance of rain, cover the area to protect the grout from potential rain damage.