Watco Masonry Waterproofer is a colourless, breathable water repellent treatment for brick, concrete and stone walls. It is supplied as a cream that is applied to the wall surface in a single coat using a roller or brush.

Watco Masonry Waterproofer is easier to apply and penetrates much deeper than traditional liquid systems. It can penetrate brickwork by up to 12mm, giving better protection against wind-driven rain. It does not block pores, but lines them with silanes and siloxanes which repel water but still allow the substrate to breathe.

Watco Masonry Waterproofer penetrates more deeply than the small cracks in the surface that compromise the performance of ordinary waterproofers. The deeper penetration also means the treatment takes longer to be eroded by weathering, and gives better protection against wind-driven rain.

Its white cream appearance makes it easy to ensure complete coverage. In an hour the coating will have started to penetrate the wall and turned clear. After 24-48 hours it will reach maximum penetration and cannot be seen easily. Watco Masonry Waterproofer is highly resistant to UV light and has a life expectancy of 20 - 30 years.

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• Features & Benefits
• Surface Preparation
• Application
• Curing

Features & Benefits

• For exterior brick, concrete and stone walls
• Easy to use cream formula
• Penetrates more deeply than conventional water repellents
• Typical penetration for standard waterproofers is 3mm, Watco Masonry Waterproofer typically penetrates 9 -12mm
• Resists driving rain
• Helps keep buildings drier and warmer

Surface Preparation

Suitable for use on porous, unpainted surfaces only. It is alkali resistant and can be used on recently pointed walls (minimum 7 days old). It lines pores up to 0.3mm wide. Wider crevices should be filled, e.g. by a sand and cement mix.

Watco Masonry Waterproofer is intended for use above ground level. It will not be effective against rising damp when hydrostatic pressure is a problem below ground level.

Surfaces must be clean, dry and sufficiently porous to allow Watco Masonry Waterproofer to penetrate.

Remove all surface growths by wire brushing. Seal any cracks or joints. Do not use detergents to prepare the surface.

Application

Apply by roller, then use a brush to treat areas close to window frames etc. Any splashes on paintwork or glass should be wiped off within a few minutes. Any areas that were not reached by the roller (such as deep mortar beds or voids in brickwork) should be treated by brush.

Solvent based coatings may be applied after 24 hours at 15°C providing that the surface has fully cured.

Curing

Watco Masonry Waterproofer looks white immediately after application, so it is easy to tell which areas have not been treated.

Watco Masonry Waterproofer starts to penetrate the masonry 15 - 20 minutes after application. It will be resistant to light rain after two hours.

After 24 - 48 hours the wall will have returned to its original appearance.

Watco Masonry Waterproofer penetrates deeply over time, so it can take up to two months for a noticeable beading effect to appear when rain strikes the wall.

Curing times will vary depending on the porosity of the surface and weather conditions.