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Did you open any of them? Did they have any liquid in them?? If not, then they're not osmotic, they're voids... If they were dry, then you can grind them a bit, coat with epoxy and then fill with thickened epoxy and then paint.
Whether you need to add fiberglass has to do with how deep the blisters are. If the blisters are just below the gelcoat, then you probably don't need to add any fiberglass. I wouldn't use West Systems epoxy. System 3, MAS, and the epoxy from Progressive Epoxy Polymers in NY are equally good and far less likely to blush.
If you want to barrier coat them, use Interprotect 2000E, and use four coats or so. It does come in quart-sized packages. IMHO, it really isn't necessary, since epoxy is water impermeable. But, you might want to just use one coat to act as a primer to help the bottom paint stick to the repaired areas. If you're doing this, remember to "hot coat" the bottom paint to the Interprotect 2000E.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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