Ronseal high performance wood filler is a chemically bonded filler and catalyst that provides extremely tough repairs to virtually any wood damage without shrinking or cracking fills to any depth and can be drilled screwed or planed ideal for use in interior or exterior wood repairs more than 5mm deep typical areas include window frames sills doors and door frames for minor and surface wood repairs use ronseal multi purpose wood filler available in natural dark or white application filling knife