Hardens like steel in 20 minutes. For use on plumbing, underwater, bathroom, auto, electrical and most any place in the home. Stops leaks, easy mix, makes repairs fast. Plugs, seals, mends, patches and is non-toxic. Patches holes, cracks and mends almost anything that is broken. Excellent to rebuild or fabricate parts and as an all-purpose adhesive for metals, wood, glass, masonry, ceramics and many plastics. Do not use with polyethylene or polypropylene. Can be drilled, tapped, filed, sanded and painted like metal. Note: You must press until trapped water is forced out from under putty when repairing leaking pipes. Wet putty will require longer cure time.