Bondloc b2001 is a hand kneadable speciality epoxy putty that mixes in 1 minute for permanent repairs to many substrates contains fading black dye that becomes grey after mixing may be applied under water fresh or salt bonds to fibreglass metal wood concrete and glass not yellow to uv exposure hardens in 10 minutes back in service in an hour full strength in 24 hours can be used for repairing tanks and drums patching holes in pipes stopping leaks and repairing porosity holes in castings specific