Back in the 60s when I was in high school, the old cars then, from the 1930 through the 1950s, for the most part, had a dull paint by that time. I owned a 36 Chevy that looked better in primer than the original paint. My parents had cars from the 1950s, fords and Chevies and a Chrysler. The paints were getting pretty dull by then. The enamel paints held up for a few years and each wash and wax removed some of the paint. Want it to shine, then use a polishing compound first. The road salts in winter and the oils from the roads took their toll on the paint. In 1972 when I bought my 71 Challenger, it still had a pretty good shine to it, but I noticed that the B5 blue started getting lighter. Each time I used a self cleaning wax and it removed a little paint, but I could get it to shine, but not like the mirror like finish the clear coat provides. I noticed the metallic flakes was getting exposed giving a slightly lighter color. Along came acrylic enamel and I had the car repainted. It was better and lasted longer. Then came the paints we have now which has the clear coats protecting the color coats. A glass like finish. Looks great. I didn't mention the lacquer/clear paint jobs of 50+ years ago. Very beautiful but tough to repair and they could get spider web cracks. The new factory finishes used in the last 20 years get thin over the years and the clear coat separates and peels after a few years. We see cars every day with lifting clear coat. Like everything on our cars, it seems nothing lasts forever. BTW, want to see what enamel does, use Rustoleum enamel paint to spray a car. Put on 3 coats and see what it looks like in a few years. I did a Jeep that way in 2007. By 2015, the paint was coming off every time I waxed it. Enjoy them while they shine and enjoy the survivor cars when you see them. This is a long post for me.
Terry W.