Ding All first introduced this repair kit in 1985 - and it's still the go-to standard for fixing polyester dings. Packed with Ultra Clear and Non-Yellowing Silmar Polyester Sanding Resin (250A), the same kind used in most polyester surfboard making. Plus, you'll get a bottle of our liquid hardener for extra strength. Perfect for quick and easy fixes on small to medium dings! KIT INCLUDES: x1 - 2oz. Sanding Resin Plus Hardener - 60 minute cure time at 77 degrees F. x1 - 6” x 13” - 4 oz. Lightweight Fiberglass Cloth x1 - 2 Sided Sanding Pad ( 1 x 80 grit and 1 x 120 grit) x1 - Measuring Cup (Can be re-used by popping out hardened resin) x3 - Mixing/Applicator Sticks x1 - Clear Mylar Cover Sheet - Cover over small dings, peel off when hard. Easy application instructions.