There a couple of threads on the HAMB, one is current right now, detailing a $30 paint job using Rustoleum paint. 30 bucks was for the whole kit and caboodle. Within the thread is reference to a rolled on paint job on a Corvair. It looks terrific over 3 years later.
In the "New Economic Reality" that looks to be a pretty viable alternative to spending the long dollar on a pro paint job. It certainly has my attention for my Suburban project. All that roof area and all!