Renowned for its incredible strength and versatility, Gorilla Glue expands into materials to create a durable bond which is 100% waterproof and resistant to extreme temperatures. The water activated polyurethane formula expands into materials to form an incredibly strong bond to virtually anything, making Gorilla Glue the perfect solution for a wide range of projects, both internally and externally. Gorilla Glue 250ml. Gorilla Original All-Purpose Glue is suitable for indoor and outdoor use. This ultra-strong and versatile glue is 100% waterproof and resistant to extreme temperatures. It has a water activated polyurethane formula, which expands into materials to form an extra strong bond.