Tetrion All Purpose powder filler is quick and easy to sand and can be used for both internal and external filling. All purpose filler seals and fills most household materials including plaster, wood, stone, concrete, brickwork and metal with a tough smooth finish, sand and over-paint after 24 hours, apply in thickness of 3mm to 10mm. For exterior applications over-paint with an oil based paint. Mixing with water is required.