I have also had these "bubbles" between paint layers from time-to-time.
Just happened that the last time was during a hull survey while the bottom was being pressure washed. The surveyor wasn't surprised given the age of the boat. His suggestion was to media blast the bottom of the boat and start over again if they were extensive. When you get four or five layers of different paints, this is not unusual. They are not "blisters" per se, as long as they are not under the gel coat.
So not to worry!!
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Larry B
Careful . . .I Have a Generator and I'm not afraid to use it !
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