Lacuqer paint

Back in the old days, GM used lacquer, while most of the rest used enamel. The Lacquer looked better in the showroom, but years down the road, the enamel held up better.

I have cars painted in base/clear, and it looks nice, but i think it is a bit brittle compared to acryllic enamel, like DuPont Centari. Most urethanes are way too shiny if your goal is to have an original looking finish. I am painting my current car in Centari, with urethane under the hood. Yes, acryllic enamel needs more maintenance, like cleaning and waxing, to maintain its appearance, but everything is a tradeoff.

If your body work isn't PERFECT, a hyper shiny finish will highlight even the tiniest flaws in your prep work.