The OP said the blisters subsided while the boat was still in the slings, so assuming that was no more than a couple of hours, they most likely were paint blisters.
Both gelcoat blisters and hydrolytic blisters can subside but it usually takes a couple of days at least. it's very easy to see if they are paint blisters ...... pop a couple and look.
Don't rush to shoot the surveyor quite yet.
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