presto styrene-free polyester resin is an elastic, highly reactive unsaturated polyester resin that can be used on practically any surface, in particular in conjunction with glass fibre fabric or glass fibre mat for bridging larger holes, rusted areas and damage. Can be used on metal, wood and concrete, in the automotive sector, in the home and garden (spray fibre ponds), for mould and model making, and other industrial sectors such as on leaking pipes, boilers, boats, etc. If the surface is to be painted, further treatment with presto filler or presto fine filler is recommended.