When is it good to Sand/ Media blast your car?

My car has no rust either except a bit of surface rust in the trunk and a just a tiny bit of surface rust on the standard area of the passenger floor pan inside the car. 15 Minutes with a wire wheel and some POR15 will take care of it. I would rather spend that extra $$ on the getting the body ready for paint. A good paint job is based on excellent body work and that is why all of us drool over a killer paint job. "The foundation was prepared correctly"