U-Pol ISOPON P.40 Body Filler for Holes is the ideal choice for repairing and priming rust holes up to 75mm wide in most types of metal ready for painting. This 250ml tub of 2K polyester bridging compound, reinforced with glass fibre, is suitable for use with all metals including galvanised steel and also for filling and bonding wood and concrete. It creates strong, watertight repairs and sets hard quickly, ready for shaping and painting. The hardener is included and the compound can be sanded and painted over after 20 minutes. It is designed to bridge holes and provide a smooth surface.