A polyester based glass fibre paste and hardener. The paste and hardener are supplied separately, and once mixed it becomes a user friendly filler which is ideal to repair damaged alloy, metal, masonry, stone, aluminium and fibreglass parts real fast. It also contains rust inhibitor, aluminium and fibreglass strands which provide excellent bridging properties and reduce sagging for covering those large holes. No need to weld in patches. The cured colour is a dark grey. Molds like putty and can set hard within minutes. Can be used inside or outside and can be painted within the hour. Goes through curing stages and can be wiped off, spread by putty knife, shaped and cut while it cures, and it will result in a hard sandable surface when completely cured. Then it can be painted. Once hardened, you can file, sand, saw, drill, machine, tap, paint, nail and screw into it! Ideal for repairing rust. Economical and strong when filling large holes in metal sheets and masonry. Typical examples are vehicle crash repair work, rusted industrial bonnets, repairing holes due to rust in metal piping, cracks and holes in concrete steps. One can vary the ratio of putty to hardener and speed up or slow down how fast the putty cures, to suit the job.