Dealing with similar issue, though yours do appear to be larger and deeper than the bubbles in mine. Spent hours and hours and hours researching. Read every article, report, study, test and opinion I could find on the internet
. For every ten articles published there were at least 12 different opinions expressed. Everything from
A. your boat is ruined unless you strip 2-3 layers of glass off the hull and relay with resin X, Y or Z
to Z. hit with a sander and 60 grit, slap on some bottom paint
and don't worry about it.
Some said sand or soda blasting is the only way as it gets into all the soft/weak spots to blasting will ruin the boat as it opens up lots of fibers an a quick path for new moisture to diffuse into the glass so use only a power planer type tool.
Every opinion on resin type you can imagine.
My final decision. Go with a planer not blasting. For me this was the right choice because the blisters
were very shallow and it leaves a much smoother, cleaner surface making the restoration
part a lot easier. Also a lot less messy. The blaster may work better in some cases. Not sure if the rougher surface and exposed, broken glass fibers will make a path for future water
penetration or not.
Vinlyester resin in tests seems to show slightly better resistance to moisture penetration than epoxy but I chose Interlux
2000 epoxy for two reasons. One I am familiar with it and it seems to be tried and true. Second the guy I hired uses it and prefers it.
Ask me in ten years how it worked out.