The U-POL Extra Polyester Filler is a two-component multi-function paste used for the filling of small holes & imperfections in most substrates. It has been specially formulated for the professional user and combines good filling and smooth spreading properties together with ease of sanding. This U-POL filler is suitable for the following surfaces: steel, aluminium, zinc coated substrates (degrease and abrade with P80 paper), original paint surfaces (with the exception of thermoplastics) degrease and abrade with P180 and on GRP, degrease and abrade with P80 paper. Two-component multi-function paste used for the filling of small holes & imperfections Suitable for use with most substrates Sandable after 20 minutes (at 20C) Can be over-painted with most paint systems including 2K 1.1 Litre.