Use with Bondo Fiberglass Resin for strong waterproof repairs Use to repair holes or cracks in fiberglass, wood and metal Cloth pattern provides reinforcement for a strong repair Waterproof and paintable Versatile product works for repairing automobiles, boats, tubs, showers, sinks, pools, hot tubs and more Bondo fiberglass cloth is thinner and more flexible than Bondo Fiberglass Mat to provide a smoother finish Cloth will not rust or rot Does not expand or shrink with temperature change 0.20 mm cloth is generally cut to fit with scissors for uniform repairs Use during the Fill stage of the 3M Body Repair System