Not Ranked
Not really disagreeing with you per se, but the boat I mentioned has spent 90% of it's life on the southeast coast, Gulf coast, Caribe, or So CA. It's cabin top has pinsize blisters to those the size of half dollars, dry no moisture, no seperation of laminates, boat is 24 years old and the blisters began showing up about 2 years ago on the cabin top, currently on the hard @Svensons Boatyard in Alameda(SF), Ca, undergoing repairs.
Basically my belief is that the SPF had an improper cleaning of the body shell or there was moisture present when it was painted.
Or if it is in the exhaust exit area it could be due to heat as Bill Wells suggested.
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"Breathe in... Breathe out... then move on with life. Lifes too short to sweat the small stuff"
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