Wearcoat 100 Two package aliphatic urethane, polyester type, finish coating for exterior applications and can be applied over a wide variety of properly prepared and primed substrates including structural steel, cold rolled steel, aluminum, concrete, plastics and galvanized steel. WEARCOAT 100 has non-yellowing, non-chalking properties combined with excellent abrasion, chemical, solvent and good heat resistance properties. It provides excellent gloss retention and will continue to retain a high gloss through many years of service.