I Googled media blasting Corvettes and one thread through all of them is that you better have someone who has done fiberglass before do the job. More negatives than positives on soda blasting. More folks had better results with plastic media blasing. The best technitions can take off the paint and leave the primer
I had my car professionally blasted by a place that has been doing this for a very long time. http://www.fishburnproctor.com/
They have blasted many collector restoration project cars. They have a variety of media available and have done work for me in the past. However it was not cheap by any means and I would not repeat the process with soda on fiberglass again. It is great on metal but the neutralizing requirement still exists.
Thanks guys. I have been reading up on soda and I think I will pass on it. I am probably going to old school it with the DA. The more I go over the car the more small imperfections I find that will need additional attention.