Creates Long Lasting Bonds For Auto And Boat Restoration And Repair Projects Paintable 100% Waterproof Repairs On Fiberglass, Metal, And More Sandable In Less Than 2 Hours Use With Bondo Fiberglass Cloth Or Mat For Stronger Repairs Includes Bondo Fiberglass Resin Liquid Hardener For Convenient, Accurate Mixing When Cured Product Has An Amber Color Compatible With All Paints, Including Gel Coat And Marine Paints. Can Be Used As A Sealant Alone Use During The Fill Stage Of The 3M Body Repair System Bondo Fiberglass Resin is an industry standard for restoration and repair of vehicles and boats. The high strength polyester resin features a waterproof formula, is highly durable and provides long-lasting repairs. Bondo Fiberglass Resin is a strong material commonly used for autos, boat building and other repairs. This high-strength polyester resin can be used with fiberglass mats or cloths on surfaces including fiberglass, wood, metal and masonry to repair metal rust-outs and to recreate or join surfaces. It can also be used by itself as a wood or concrete sealer. It accepts nearly any paint system.