Ronseal Wood filler 275g. This wood filler from Ronseal has been specially designed for re-building rotten wood & for major repairs deeper than 5mm on window frames sills doors & door frames around the internal & external areas of your home. It provides tough & durable repairs to any wood it's used on. It's best applied with a filling knife or spreader & can be drilled screwed or planed once dried. It's sandable heat resistant & drip resistant too.