GE SCS1000 Contractors silicone sealant is a one-component acetoxy silicone material that provides excellent weatherability and elasticity for general purpose sealing and bonding. SCS1000 silicone sealant is a paste material, which cures into a flexible rubber when exposed to atmospheric moisture. SCS1000 Contractors sealant securely bonds without a primer to many common substrates and finishes, including glass, ceramic tiles, porcelain, painted surfaces, some plastics, galvanized metal, cultured marble, polished granites and marbles, and many composite materials such as fiberglass. Some substrates or finishes may require a primer.