RESIN JELLY FIBERGLASS 1GALrepair damaged fiberglass boats, snowmobiles, jet skis, bathtubs and showers. Use as a sealer on damaged and rotted wood. Seals concrete. Use on large or small metal rust-outs. Joins most surfaces together while creating a strong and long lasting bond. Sandable in less than 2 hours. Compatible with all paints, including gel coat and marine paints. Waterproof. Includes liquid hardener.