Acrylic enamels, on the other hand, are more durabl e and resistant to chemicals and sunlight. And many restorers prefer enamel because it produces a high-gloss finish. Enamel dries more slowly than lacquer. It has a tendency to collect dust or sag and run if too much paint is applied. And what makes enamel more durable also makes it harder to polish or sand.
Acrylic enamel paints do have a clear-cut superiority over lacquer when it comes to engine castings.
In this case use only special heat-resistant enamel formulations. A growing number of veteran restorers do highly recommend using a catalyst or hardener with whatever paint you buy. I haven't seen any evidence of increased chipping due to the use of a hardener. Then you can mix it in fresh just prior to painting. I've had it go bad when I was off just a little.