Best known for its bridging capabilities in rebudiling shattered fiberglass and for reinforcing torn or rusted areas of sheet metal. Formulated with long strands of chopped fiberglass. Double the strength of standard fillers. Waterproof. Rustproof. Can be used with or without fiberglass cloth or mat. Should be finished with RageŽ and/or Metal GlazeŽ. Blue cream hardener included.