This specifi cation covers the requirements for a highperformance two-component UV-stable polyurethane topcoat (ASTM D 16@ Type V polyurethane). It is intended as a topcoat that provides excellent color and gloss retention@ not as a thick-section elastomeric coating. Coatings meeting the requirements of this specifi cation 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 specifi ed coating is intended for application by brush@ spray@ or roller. It is generally applied over a primer or intermediate coating.