If a person attached a battery ground lead to the car body and a battery positive lead attached to the paint gun, will the paint go on like an electro plate paint job?
I agree with Les. I do recall, however, that some of my older books on auto painting recommend to ground the car to the floor (like by setting the frame on steel stands) to help keep the car from picking up static electricity to attract dust and debris.
No. You need higher voltage. In the range of 5-15kv I would guess. This obviously presents a problem with a metal bodied spray gun. I've been shocked by static discharge spraying paint in an ultra-dry environment. Static electricity builds up in the gun and you until you touch something. I had to ground the gun as well as the car body during that shoot. It wasn't fun finding out about it either.