ABS is a little more forgiving. You may be able to use the walnut shell pretty well on that one I'd think. The poly abrasive is also a good choice. I'd just tend to be a little more careful with the fiberglass is all.... you don't want to eat through the gel-coat on anything. I do believe after blasting fiberglass you might have to give it a good final hit with 2000-grit just to take all those little "pock" marks out. Another thought is baking soda? I dunno... somebody who's used that one will have to chime in. Good post to invoke the "thought process" though.
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