National Water Repellent (W.B.) is a silane-siloxane mixture in water-based emulsion having excellent capillary penetrations and adhesion to concrete, natural stones, plaster, gypsum board etc. This enhances a uniform coating to all capillaries and improves the toughness with excellent water repellency and salt resistance. It is an inorganic transparent matt clear coating for mineral substrate protection. It contains anti fungal and anti bacterial additives. RECOMMENDED USES National Water Repellent (W.B.) is a factual selection to provide excellent water resistance to concrete, natural stones, gypsum board etc. without any change in original colour and appearance. The dry film is hydrophobic in nature and is used also for the impregnation of construction blocks to improve toughness and salt resistance in the construction field.