"Gorilla® Waterproof Coat & Seal is a flexible, rubberised coating that seals out water, air and moisture. Perfect for repairing leaks, the liquid is easy to apply – you simply brush it, roll it or pour it. The self-levelling formula seals and protects by smoothly covering small gaps and cracks to create a weatherproof, watertight seal. Great for: roofing, gutters, drainage pipes, external chimneys, conservatories, windows, uPVC, caravans."