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 wont. 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.