Ronseal wood filler 275gthis 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 its used on its best applied with a filling knife or spreader and can be drilled screwed or planed once dried its sandable heat resistant and drip resistant too