USC 24030 Duraglas is a fiberglass-reinforced, 100% waterproof body filler for high-strength marine and automotive repairs. It bonds to fiberglass, steel, aluminum, wood, and more. Mix with the included cream hardener (≈2% by weight) and sand in about 15–20 minutes. Ideal as a first-layer repair over rust-outs, cracks, and holes before finishing putty. Reinforced with short-strand fiberglass Waterproof and durable in wet environments Feathers nicely; max sanded thickness ≈ 1/4"
