General description Ronseal High Performance Wood Filler is a chemically bonded filler and catalyst designed for tough repairs to virtually any wood damage without shrinking or cracking. It is suitable for both interior and exterior wood repairs, particularly effective for areas more than 5mm deep, such as window frames, sills, doors, and door frames. This high-performance filler is available in Natural, Dark, or White colors and comes in a 3.7kg tub with a re-sealable lid. Technical specifications Size: 3.7kg Colour: Natural Drying Time: approx. 30 minutes Protection Level: Very High Durability: Flexes with the wood to prevent shrinking or cracking Finish: Matt VOC: Medium Installation For best results, remove any soft wood if repairing rotten wood and treat it with Ronseal Wood Hardener. Mix a pea-sized amount of hardener with a golf ball-sized amount of filler until uniform in color. Pack the filler into the hole, leaving some raised above the surface, and smooth it over with a