What is RP120 Water Repellent? RP120 is an excellent water repellent for many absorbent materials, such as bricks, sand-lime brick, natural sandstone and mineral plaster. It is not suitable for less absorbent dense natural stone, especially limestone, marble and reinforced concrete for bridges and roads. Owing to its aqueous consistency and storage stability, RP120 is ideal for building materials made of clay, aerated concrete, sand-lime brick, fibrous cement minerals fibers and lightweight aggregate. Features Good depth of penetration Rapid development of water repellency Highly durable and effective beading effect Tack-free drying Provides good adhesion for paints Water-based and environmentally compatible Stable in storage