Resurfacing, recoating and refinishing services alter or restore damaged coatings or surfaces to a usable condition. They perform five basic types of services: coating, finishing, cleaning, plating, and thin-film processing. Resurfacing, recoating and refinishing services may also perform architectural refinishing, on-site resurfacing, and web recoating activities. Material capabilities are an important specification to consider when selecting resurfacing services. Metal substrates are made of aluminum, copper, copper alloys, iron, cast iron, nickel, nickel alloys, precious metals, steel, steel alloys, stainless steel, or titanium. Non-metal substrates are made of ceramic, glass, plastic, polymer, or wood.