Is a hand kneadable permanent repair putty that can be used to seal, fill, repair most metals, fibreglass, concrete, wood, stone etc. It can also be used underwater (fresh or salt). It can be used to repair leaking tanks, pipes, drums, patching holes, stopping leaks, repairing porous holes in castings, filling holes in brickwork, building up worn or broken metalwork, sealing cracks in metalwork. It can be sanded after 10 minutes and drilled when fully cured in 1 hour. 50g Stick.