Epoxy putty hardens like steel in 20 minutes. Ideal for plumbing, electrical, auto, and home repairs. Plugs, seals, patches holes, and cracks and mends almost anything broken. Can be used for underwater repairs. Excellent for fabricating or rebuilding parts and for use as an all-purpose adhesive for metals, wood, glass, masonry, ceramics, and many plastics. Can be drilled, tapped, filed, sanded, and painted like metal. NSF certified for use in potable water applications. Do not use with polyethylene or polypropylene.