Soda Blasting Jason.. Some ppl use walnut shells with good success, but I've never used them and really can't speak from experience on them.
Soda media, although the same thing as Baking soda that you buy in food stores, is a much courser, hollow grain.. when it's shot at the paint it hits with enough force that it literally explodes,, the force of that explosion tears a tiny bit of the paint loose as it hits... now multiply that by thousands of grains a second and you see why it's so effective. But the media is so soft that it will not damage the sub-strata..... in this case your fiberglass. Do an internet search on Soda Blasting and you'll find many sites dedicated to selling it and the theory behind it. One of the best sites is, (not surprisingly) Arm & Hammer's site.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God)
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.