[Zeke]

Peter, if your car is in primer, why bother with the bat? Take a 2 foot piece of 1/8 welding rod and bend it to fit the arch of the wheel opening. Lay it up on the top side of the lip and take a nice wide face hammer and beat the lip up 90* using a piece of heavy steel or body dolly as backing on the outside. The rod will keep the lip from being folded over on itself so you will have a nice edge but maximum tire clearance.

It's hard to get as nice of job with a bat. If a car is painted, you probably shoudn't beat on it with a hammer. But, I've done that too using a piece of Nylon between my dolly and the paint. Going slow and not missing (LOL), it can be done.