I'm not sure where you're located, but there's a place I found in Oakland that does a lot of cars. I've seen everything from Jag XKE's to model A Fords in there. However, I don't think they shoot any primer. Oh, and don't be scared off by their name. They shoot other types of media besides sand!
Myers Sandblasting, Inc.
800 Moorpark Street
Oakland, CA 94603
510-638-0444