The Harmony Fiberglass Repair Kit lets you return your damaged Fiberglass hull to its original functional condition. This Fiberglass repair Kit include three pieces of woven 5 oz. Fiberglass fabric, one quart vinylester resin, 12 cc catalyst, sandpaper, sanding block, disposable gloves and instructions. The materials provided are adequate to repair up to two fractures or punctures up to 8 in. / 20 cm long.