Unique fiberglass reinforced filler containing short, interlocking strands and fibers to make it twice as strong as regular body filler. Repairs small rusted out metal, shattered fiberglass fenders and body parts. Eliminates the need for backing strips or fiberglass resin/cloth. Spreads easily and is sandable in only 20 to 30 minutes. Waterproof, compatible with all paints. Includes filler and cream hardener.