•SCS1000 Contractors 100% silicone is a one-part sealant for sealing and glazing, bedding and grouting tile, sealing countertops, fixtures, drains, and more. •The non-sag paste applies easily and quickly becomes weather-resistant. It won’t crack, separate, or dry out, even after years of exposure. •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, as well as many composite materials such as fiberglass. Some substrates or finishes may require a primer.