Specifically engineered for ease of use, Gelson Clear Sealer Primer has outstanding filling ability, allowing it to be applied directly to carbon fibre or composite surfaces. This unsaturated, polyester resin-based primer has a temperature resistance of 90°C (post flash off). Once applied using a standard gravity-fed spray gun in temperatures greater than 15°C, Gelson Clear Sealer Primer will be ready to sand 16-20 hours after application.