U-POL FastFill 2-Part Filler that fills to any depth and is Quick Drying in just 10 minutes. FastFill uses fast drying snap cure technology and is lighter than FastFill. For both interior and exterior, sand with 60 - 80 grit and 180grit to finish, hardens in approximately 10 minutes. It adheres to wood, metal, concrete and masonry and does not slump and can be over coated with any paint. FastFill is ideal for multi-purpose applications such as; filling holes, damaged edges, splits and shakes in timber, mending metal pipes. Filling cracks and holes in concrete, and building up damaged areas, also repairing and skim coating GRP. Model and pattern making and also dents in cars and metal vehicle bodies. Mixing FastFill, mix 2 parts hardener to 100 parts filler, tin contains 1.1 litres of filler, and one squeezable bags with re-seal able screw-fit caps containing hardener and one spreader.