Dynatron™ Fiberglass Resin is a durable, professional-quality polyester resin for repairing and restoring a range of materials including metal, wood and fiberglass in auto body repair. This resin accepts most auto and marine paints, including gel coats. With Dynatron™ Fiberglass Mat and Fiberglass Cloth, it is ideal for repairing large rust holes in metal and repairing fiberglass parts.