Use on porous and non-porous surfaces indoor and outdoor. Sticks where others won't. Adheres to aluminum, steel, PVC, glass, concrete, fiberglass, polystyrene, plywood, drywall, ceramic, porcelain, stone, laminate, wood and MDF. 100% silicone adhesive. Does not contain isocyanates and is low in VOC, making is safe for interior and exterior use. Backed by a lifetime guarantee, so once cured, it will never shrink, crack, break down or yellow.