Just remember that a $50 paint job is, well, a $50 paint job. Sure it might look good to some people, maybe even passable to someone as picky as I am, but I wouldn't use Rustoleum or similar paint on a vehicle unless I was about to destroy it or sell it to someone I didn't like
It isn't going to last long and if you or someone else wants to put a real automotive paint on the car, the Rustoleum will have to be removed.