Bondo® Short Strand Fiberglass Reinforced Filler makes an excellent foundation for hole, dent and rust-out repairs without the need for backing strips, cloths and resins. It contains short, interlocking fiberglass strands and fibers that make it stronger than regular body filler. It is also slightly thicker and provides a fast drying time, making the filler less messy on vertical surfaces like car doors. 3M Identifiers: 7100314737, SS-PT-ES, 00051131002777, 00051131002777, 00076308429225, 70076308429224 Fiberglass strands and fibers make it twice as strong as regular body filler Excellent as a foundation for hole, dent and rust-out repair Can be paired with body filler and glaze for complete repairs.