Ronseal High Performance Woodfiller Natural 1kg | Tough, Structural Wood RepairTackle virtually any wood damage with Ronseal High Performance Woodfiller. This powerful 1kg, two-part filler (filler and catalyst) provides extremely tough, permanent repairs to deep damage, making it ideal for structural elements like window frames, sills, and doors.Rock-Hard and Permanent: This chemically bonded formula sets rock hard, allowing it to be used to rebuild rotten wood. It provides a durable fix that effectively cures wet rot and prevents its recurrence. Crucially, it hardens without shrinking or cracking, ensuring a repair that lasts.Ready for Anything: Perfect for major repairs deeper than 5mm, this filler is suitable for both interior and exterior wood. Once cured in just 30 minutes, the repair can be treated just like real wood: it can be easily drilled, screwed, or planed, ensuring a seamless finish. For minor surface repairs, use Ronseal Multi Purpose Wood Filler.