I'm a regular over earlycj5.com, and one of the guys over there painted his Jeep CJ with Rustoleum spray cans, and Rustoleum clear (rattle can). It came out really nice...
Check it out:
Here's the thread.
http://www.earlycj5.com/forums/showthread.php?t=42745

Here's the finished product:



It came out great, but man you need a lot of rattle cans.