3M(TM) Scotch-Grip(TM) Construction Mastic Adhesive 4323, 5 gal pail, 1 per case Drum High performance panel and construction adhesive for both interior and exterior use. This versatile adhesive bonds to many hardwoods, plywood, concrete, aluminum, steel, polystyrene foam, FRP, and some plastics. Resists water, heat, and dead load creep. Not suitable for exposed outdoor applications. GALLONS AND LARGER - NOT INTENDED FOR CONSUMER SALE OR USE.