Gorilla® Waterproof Coat & Seal Spray is a flexible, weatherproof coating that seals out water, air and moisture. Perfect for stopping small leaks, this formula seals and protects by easily covering to create a heavy duty, watertight seal. It’s durable and versatile, for use both indoors and out. Once cured, the product is waterproof and temperature resistant. Great for: Roofing†, Gutters, Downpipes†, Windows/uPVC, External Chimneys† & Small Repairs on Caravans.