Epoxy filler for repairing holes and cracks in fiberglass reinforced plastic. steel. aluminum, etc. on surfaces. Creates a hard and wear-resistant surface. which is also resistant to water and chemicals. Can work 3-6 hours after application. No painting required. but sand the repaired surface before possible further processing. After the surface treatment, the repaired area can be painted with 1- or 2-component paints with a suitable primer.