About Metal Coatings Firearm Coatings The coating on firearms wears off over time, leaving the metal exposed to rust and corrosion. Solvents, hand oils, moisture, dirt and handling remove the protective metal coating. There are DIY kits sold that claim to restore firearms to their original beauty and protect the metal, but may not live up to their promises. The best solution for repairing or replacing the coating on firearms is to have a professional company perform the service. Vacuum Coatings Protective coatings are not just for guns. Coatings can be applied to auto parts, hardware and outdoor furniture, to name a few. Reflective coatings work in a variety of…