Lots of body shops have what you might call an oven, but the difference (as some have mentioned) is they aren't nearly as hot as what they can use at a factory on a bare car/panels.
The ovens I have seen recently are incorporated in the paint booth and are mainly used to kick start the curing process. I was only painting a set of fenders and a hood at the time, and even though the booth we used had the oven feature it didn't get all that hot. With a complete car in there too much heat would destroy the tires, rubber stripping, and interior components.
Hey
stiffdogg06,
you ever eat a Massey's Pizza up there in Columbus? That's where I grew up and it's still my favorite pizza.