It is a highly water resistant, non-flammable adhesive designed for installing Marlite Brand FRP panels over existing porous-surfaced walls. Do not use on Marlite Plank or other wood-based products. Meets ASTM Specifications C557. Also recommended for bonding polystyrene foamboard, polyurethane Foamboard, tileboard, and decorative strips to any structually sound, porous interior surface, such as drywall or plywood. 

3.5 gallon pail