Imron is "polyurethane enamel", literally spray-on plastic. It is very durable, and has a "wet" look even when dry. Downside- - - -it's a little brittle, and will chip from a door ding occasionally. Don't let leftover paint stand in a spray gun, as it cures solid in just a few hours. Expensive, but very good quality. Peterbilt paints all its trucks with Imron.
Jerry