When media blasting a car, try to ask for Walnut shell blasting. If the rust is really intense, I would hand sand that area. Aluminum Oxide, if applied heavy to remove bad rust, might warp your sheet metal.
I've used POR 15 and it is fantastic for covering and eliminating future rust. Make sure you use their primer. It would be hard to paint over their paint. Also, POR 15 is like Powdercoating an item. It's nearly impossible to get off even when sand blasting! It's not impossible, but difficult. It's a great product. I did all of my suspension and chassis with it. It still looks like new after 5 years!
RapRap
1940 ChoppedChevyCoupe
