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The purpose of Ronseal's High-Performance Wood Filler Catalyst is to activate the hardening process when combined with Ronseal High-Performance Wood Filler. The white catalyst starts working within seconds. You only need a pea-sized amount of the hardener for a golf ball-sized amount of filler.A chemically bonded filler, Ronseal's High-Performance Wood Filler is compatible with both indoor and outdoor use. It is particularly well-suited for repairing window frames, sills, doors, and door frames.Features & Benefits: RONSEAL High Performance Wood Filler Hardener Catalyst - 30g, Fast working to save on time, Only a small amount is required to begin the chemical reaction, Aids in forming a robust and long-lasting filler for damaged wood, White in colour, Compatible with indoor and outdoor use, Well-suited for repairing window frames, sills, doors, and door frames. RONSEAL High Performance Wood Filler Hardener Catalyst - 30g Natural