Flex Caulk is our latest innovation in caulking technology. It's a high-performance, hybrid polymer caulk, delivered through our Adjustable Trigger Flow Nozzle, which eliminates the need for a caulking gun and allows you to control the flow of caulk. Just 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. NO CAULKING GUN NEEDED - EASY TO USE! Adjustable Trigger Flow Nozzle - perfect for hard-to-reach areas Advanced hybrid polymer formulation Seals out water, air, and moisture - 100% waterproof and weatherproof Fully paintable and extremely durable - lasts for years - won't shrink, crack, or become brittle UV, chemical, and mildew resistant - 100% waterproof and weatherproof Adheres to virtually any surface, wet or dry Snap & Save cap eliminates waste Solvent-free and virtually odorless Common Bonding Substrates: Porcelain, Plastic, Metal, Marble, Laminate, Granite, Glass, Foam, Fiberglass, Drywall, Concrete, Cinderblock, Ceramic, Brick, Asphalt, Wood Excellent for: bathrooms, kitchens, sinks, showers, toilets, backsplashes, countertops, baseboards, molding, pipes, skylights, windows, doors, auto and boat repairs, and more