Flex Seal Power Putty White is a moldable rubberized sealant that seals gaps, cracks and holes the moment you press it into place. There is no drying, no curing and no waiting. Peel the paper backing, press the putty onto the surface and trim off any excess. It bonds to metal, fiberglass, wood, glass, plastic and painted surfaces, and it is 100 percent waterproof, working even on wet or submerged surfaces. This 8 oz. tub stays a soft matte white and can be painted to match the surrounding surface once applied. Power Putty is rated for continuous service from minus 40°F to 180°F and resists UV, mildew and chemicals, so it holds up in extreme heat, cold, rain and sun. It stays flexible and will not harden, crack or lose tack, and it blocks water, air and moisture to help prevent rust and corrosion. The formula is solvent free and non-toxic and requires no specialized protective equipment. Apply in temperatures between minus 5°F and 120°F. Shelf life is indefinite under normal storage conditions.