Pool repair putty is a handy-dandy kneadable specialty epoxy that mixes in less than a minute. It is used to make permanent repairs to damp, wet areas and underwater surfaces. Pool repair putty bonds solidly to fiberglas, metal, wood, concrete, ceramic, glass, and most plastics, including PVC. Once it hardens, it can be drilled, tapped, sanded or painted. Pool repair putty hardens to a bright white in 20 - 60 mins.