Uncatalyzed enamels were used for years in the automotive industry.Are they any good? yes. They have a soft underside that makes them very chip resistant but more easily scratched. Spot repairs are difficult,but panel repairs are easy because of great color retention. They lay out nicely as long as proper reducers are used for the color and temperature. Long flash times make mistakes easy to fix but also make contamination more likely. Blush can be a problem in high humidity areas. Clears are not necessary or even desireable in a driver as enamels properly applied do not need to be buffed. They have good gloss as sprayed. A talented painter will make them as glossy as a buffed job. Color sanding between coats is not needed but can be done as long as the paint is given enough dry time between coats, like a couple weeks. Like I said, it stays soft underneath so extensive sanding isn't a good idea. A high quality spray booth is a must have. Modern cat enamels were developed to make money for the automotive industry, not because they are better. Let the flaming begin.