Original Gorilla Glue built a name for itself with its incredible, industrial holding power and versatility. The water activated polyurethane formula expands into materials to form an incredibly strong bond to virtually anything. Gorilla Glue is a 100% 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. Directions: 1.Prepare and Dampen the Surfaces: All surfaces must be clean, dust free and tight fitting. For shiny surfaces, such as metals, glass and some plastics, roughen up the material to give the glue something to bite into. Lightly dampen one surface with water. We recommend using a damp cloth or spraying with water. Do not saturate the surface. For dense hardwoods, lightly dampen both surfaces prior to gluing. 2. Evenly Apply Gorilla Glue Onto the Dry Surface. Carefully apply onto the dry surface. Do not over apply. We recommend wearing gloves or spreading the glue with a disposable brush. 3. Clamp the Two Surfaces Together Tightly. Make sure the clamping pressure is distributed evenly across then.