ULTRA CLEAR RESIN: Sun Cure Sanding Resin contains a superior Silmar brand 250A UV polyester sanding resin, which is a high-quality resin and a standard for polyester surfboard construction. Sanding resin is typically used for surfboard hot-coats and is widely popular for use with Surfboard dings repairs. SUPERIOR QUALITY: The Sun Cure sanding resin is non-yellowing and ultra-clear, non-tacky, works great with Q-Cell or cabosil fillers and dries smooth. SUPERIOR QUALITY: The Suncure sanding resin is non-yellowing and ultra-clear, non-tacky, works great with Q-Cell or cabosil fillers and dries smooth. CURING TIME: Gel 15 seconds, Full Cure: 4 to 6 minutes. Partial Sun: Gel 25 sec. Full cure 6 to 8 minutes. Light overcast: Gel 45 seconds, Full cure 15 min USED BY PROFESSIONALS: A faster alternative resin used by US and International board builders, and is MADE IN THE USA