Gorilla Waterproof Coat and Seal Black is a flexible, rubberised coating that seals water, air and moisture. It provides airtight and watertight coating, perfect for repairing leaks and covering small gaps. Flexible and self-levelling, the liquid is easy to apply and can be brushed, rolled or poured. The self-levelling formula seals and protects by smoothly covering small gaps and cracks to create a weatherproof, watertight seal. The coat and seal work in extreme conditions. It withstands wet, dry, hot or cold conditions. Great for roofing, gutters, drainage pipes, external chimneys, conservatories, windows, uPVC, caravans. For indoor and outdoor use.