Bondit Silicone Ultra Waterseal 5L is a premium grade, solvent-free silicone waterseal. Provides a micro-porous water-repellent 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 waterproofer 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 reduce heating costs, as energy is not wasted in drying out damp walls.Brush or non-atomising spray. Shake well before use.