Tetrion Powerfil - 2 Part Professional Multi-Surface Filler. This filler is drillable, paintable, spreadable, screwable, shapeable, and sandable, making it ideal for both large and small jobs. It sets in minutes, creating a repair that is easy to sand, very tough, and very smooth. The kit includes hardener and a spreader. It is suitable for use on metal, wood, stone, and most plastics. To use, prepare the surface by removing all dirt, grease, moisture, and loose material from the area to be treated. Ensure all mixing equipment is clean. Mix 1 part hardener to 50 parts filler (approximately a pea-sized amount of hardener to a golf ball-sized amount of filler), or a 2% ratio. Mix thoroughly until all the hardener is dispersed and no streaks are evident. Apply the filler immediately with the spreader. The setting reaction commences after 5 minutes, and the paste will become fully cured and sandable after 20 minutes at an ambient temperature of 18°C (65°F). Sand the repair down to the required level only when the paste is fully set. Correct any imperfections with more filler mixture after the application has cured. Note: Tetrion Powerfil is best used in warm, dry, well-ventilated conditions. In hotter temperatures, the filler mix will set more quickly; in cooler conditions, it will take longer to cure completely. Important: Never use too much hardener. Never return unused paste to the tin. Keep paste cool in summer and warm in winter.