BASF MasterProtect H 200 for concrete (formerly Hydrozo Enviroseal 20) is a clear, water-based, 20% alkylalkoxysilane penetrating sealer. It provides long-lasting protection against moisture invasion, freeze/thaw cycles, and chloride ion intrusion. Enviroseal 20 water repellant is environmentally friendly and is the perfect choice for traffic-bearing surfaces. Enviroseal 20 will not alter the surface's appearance and is one-component which makes it simple to apply and saves valuable labor time. This water sealer has breathable properties that allow interior moisture to escape without damaging the seal. Enviroseal 20 can be applied to concrete, exposed aggregate, glass-fiber reinforced, precast, cast in place/precast, silica fume, stucco, brick pavers, hard burnt brick and unglazed tile. This excellent water repellant can be applied horizontally, vertically and to interiors and exteriors above grade.