Time to update this thread:
After sanding on the car on and off for a while with a DA I decided I would give larger scale soda blasting a try. I found a local company with an industrial set up and I did my first trial run with them on my fenders, I was so happy with the results I decided to do the entire car.
Here are some pictures of the fenders, soda blasted, washed with soap and water, scuffed with red 3M scotch-brite, washed again with soap and water, wiped with final kleen, etch primed with Nason 491-17, then primed with Nason 421-19
Bare Metal
Etch Primed
Primed fender. The shell (quarters and doors pre-soda blasting)
