A premium grade, solvent-free silicone water seal conforming to BS6477 part 1,3 and 4. Provides a micro-porous water-repellant coating for masonry work, which, while repelling exterior water, allows the emission of water vapour ensuring the interiors and cavity walls remain dry. Used as a masonry water proofer suitable for use on brick, stone, concrete and unglazed tiles. It protects the surface against water and frost, providing a micro-porous coating which does not change the aesthetic appearance of a building. A secondary benefit of the product is to repel waterborne dirt and resist fungal growth as well as help reducing heating costs, as energy is not wasted in drying out damp walls.