PC-7® is the original tough job epoxy this paste epoxy was originally formulated more than 60 years ago for the maximum in bonding power. Professionals to the do-it-yourselfers select PC-7® because of its exceptional adhesion to metals ceramics masonry and many plastics. PC-7® is designed for permanent repairs. Where other adhesives fail PC-7® won’t. Choose PC-7® if you want to seal a crack in a wall attach a hanger to a ceramic plaque seal a leak in an oil pan repair a granite monument fix a leak in PVC pipe connection create a multi-media sculpture and thousands of other repairs. When mixed part-A (gray) and the hardener part-B (black) react to form a bond of tremendous strength. The PC-7® formulation is slow-curing but slow can be a good thing especially for large tasks.