Ronseal High performance Dark Ready mixed Wood Filler 550g.This wood filler from Ronseal has been specially designed for re-building rotten wood and for major repairs deeper than 5mm on window frames sills doors and door frames around the internal & external areas of your home. It provides tough and durable repairs to any wood it\'s used on. It\'s best applied with a filling knife or spreader and can be drilled screwed or planed once dried. It\'s sandable heat resistant and drip resistant too.