Flex Caulk Clear Silicone Core is a 100 percent silicone sealant delivered from a pressurized can, so you get a controlled, even bead without a caulking gun. Each 6.5 oz. can lays down approximately 30 to 35 linear ft. of sealant depending on bead size. It bonds to glass, most woods, most metals, fiberglass, aluminum, steel, ceramic, tile, porcelain, PVC, solid surface countertops and marble, making it suited to kitchens, baths, plumbing, ductwork, countertops and sanitary seals. The sealant forms a skin in 10 minutes and a 1/8 in. bead cures in 24 hours, reaching full strength 7 days after application. Smooth and tool the bead within the first 10 minutes. It is rated for service from minus 70°F to 400°F, passed 10,000 hours of QUV weathering testing per ASTM G154, and meets ASTM C920 Class 25 and NSF Standard 51. It is waterproof, weatherproof, mildew resistant and will not yellow, shrink or crack. This product is not paintable and should not be used on porous surfaces such as concrete, mortar or brick. This listing is a 4-pack.