Original Gorilla Glue built a name for itself with its incredible industrial holding power and versatility. The product that started it all. The water activated polyurethane formula expands into materials to form an incredibly strong bond to virtually anything. Gorilla Glue is a 100% brown waterproof glue safe for indoor and outdoor use and strong enough to stand up to the elements. Gorilla Glue’s your solution for almost any project or repair. Sand it paint it stain it. Simply stated it’s the Toughest Glue on Planet Earth.