Seals around sinks, showers, tubs, tile, countertops, and fixtures. Mold and mildew resistant. Watertight seal. Permanently flexible. Will not shrink or crack. Adheres to glass, tile, porcelain, metal, fiberglass, wood, drywall, and plastic. 3-hour shower ready. 100-percent silicone rubber. Meets ASTM specification C 920.