Duraglas (R) body filler is the original fiberglass reinforced automotive body repair filler. Formulated with short-strand fiberglass fibers, Duraglas provides ultimate strength and durability on rust-outs, holes, tears and cracks. Ideal for use on metal and fiberglass panels.#1 Short-strand fiberglass filled body filler Reinforced for superior strength .Use with fiberglass cloth for large repairs. Rustproof. Waterproof. COLOR: Blue-green (as packaged) MIX: 2% by weight (50:1 ratio) with supplied cream hardener. SUBSTRATE: Metal. Aluminum. Fiberglass. Wood. Masonry. Concrete. SUGGESTED USE: Rust repairs. Repair cracks and holes in fiberglass. Use on weld areas and bond seams for automotive and marine repairs. TOP COAT: All-Metal (for a completely waterproof repair). Finishing Putty.US Chemical & Plastics 24030 Duraglas (R) Fiberglass Filled Filler 1 Gallon