If you want more durability, do a couple color coats, and then do 2 or 3 clear coats. If you get runs, you can wet sand. Enamels have to cure for a while before wetsanding (2+ weeks), but tend to be a lot more resilient against wear.
Here's an awesome tutorial for how to get a mirror shine on a case paintjob.
http://www.mnpctech.com/case-mod-paint-com...mod-how-to.htmlDifferent primers are used for different materials, so make sure you find one that's compatible. The clear coat should be the same kind of paint (you don't want to use a laquer clearcoat on top of a enamel color coat)