Bondo Body Filler cures fast, shapes in minutes and is formulated to be a non-shrinking and permanently durable material for repairing metal, wood, steel, aluminum, fiberglass, and concrete. Features Lightweight and sands easily Formulated to be a non-shrinking, non-reactive and permanently durable material Repairs dents, patches holes and leaks restores chips quickly and easily Finish auto body projects the first day you start Includes cream hardener