U-POL Top Stop Red Polyester Stopper is a two-component chemical paste used for the filling of small holes and imperfections in surfaces prior to being over-painted. Very soft, smooth paste which is easily spread in thin layers to provide the perfect finish for painting and easily sanded wet or dry after a few minutes. It can be used on the following surfaces: Bare steel, polyester body filler, original paint surfaces. Comes in a 750ml tin.