Trubuild WRP 777 (Water Repellent) is a silane-based, non-flammable, water-soluble solution designed to incorporate water repellence in various surfaces such as sandstone, marble, concrete, exposed bricks, and terracotta tiles. It is used for waterproofing most construction surfaces, as it deeply penetrates the surface and provides excellent water repellence without altering the appearance or color of the substrate.