Tetrion Professional Woodfil offers a super smooth finish and is versatile for both interior and exterior use. It can be sawn, drilled, screwed, sanded, planed, carved, and painted. The filler sets quickly, starting to harden in 5-10 minutes, and can be sanded in 30 minutes and painted after 45 minutes at normal room temperatures. It is weatherproof, resisting water, seawater, oil, petrol, atmospheric chemicals, and frost. For best results, ensure surfaces are dry, clean, and free from oil, grease, and loose material. Mix one part hardener with 50 parts Woodfil until uniform in color. Apply slightly proud of the surface and sand down when hard. Large holes may require multiple layers. Once cured, it can be machined, sanded, filed, drilled, sprayed, painted, or primed. Avoid temperatures below 5°C or above 30°C. Store in a cool place, avoiding excessive heat and frost. Not recommended for use on glass.