Welcome aboard!
I think you mean hull blisters. This was more common on older fiberglass boats but can happen with newer boats as well. I recommend having the boat surveyed so a moisture test can be performed. He will also sound the hull with a dead blow hammer listening for voids.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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