I have a flat roof with parapet walls on two sides topped with coping stones. The coping stones have been painted to matched rendered walls below. I suspect that the stones are no longer totally waterproof. Can these be waterproofed with one of your products? Ideally it should be a colour to match existing Sandtex Ultra Smooth Masonry Paint - Sandblast colour. If so how should the work be carried out?

Unfortunately we cannot match a Sandtex colour, but we can mix many paints to many RAL and BS colours, but not for this application.

Assuming the coping stones are clean, dry, sound and prepared as detailed in the technical data sheet we can recommend Britannia Aquashield Eco.

This is available in black, grey or solar reflective white.