The automotive industry used acrylic lacquer for a long time, in fact I still use Dupli Color lacquer from time to time on certain things, but for the best durability to date, you really want to use a 2k urethane. It is nasty stuff, and if you're not set up to spray it safely, I would call around to some local body shops and get some price quotes. You should be able to find one that can spray it for a reasonable price. If that's not an option then the acrylic would probably be ok, but it just wouldn't hold up as well as the urethane.