Flex Seal Caulk delivers the latest innovation in caulking technology. Waterproof, weatherproof caulk formula seals out water, air and moisture with ease. The Adjustable Trigger Flow Nozzle eliminates the need for a caulking gun, allowing you to control the flow of the caulk. Simply adjust the flow setting and push the trigger for a perfect bead. And, when you stop, it stops. There's no running, no dripping and no mess. Fast-drying, solvent-free caulk is UV-resistant, chemical-resistant and mildew-resistant, making it perfect for both indoor and outdoor applications. It won't shrink, crack, yellow or become brittle over time. Use to seal sinks, showers, toilets, backsplashes, countertops, baseboards, pipes, windows, doors and more.