This specification covers the requirements for a highperformance single-component moisture-curing UV-stable polyurethane topcoat (ASTM D 16@ Type II polyurethane). It is intended to be used as a topcoat that provides good color and gloss retention. Coatings meeting the requirements of this specification are generally suitable for exposures in environmental zones 1A (interior@ normally dry)@ 1B (exterior@ normally dry)@ 2A (frequently wet by fresh water@ excluding immersion)@ 2B (frequently wet by salt water@ excluding immersion)@ 3B (chemical exposure@ neutral) and 3C (chemical exposure@ alkaline). The specified coating is intended for application by brush@ spray@ or roller. It is generally applied over a primer or intermediate coating.