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.