[Scott]

If the bottom isn’t to built up you can see blisters right through bottom paint …otherwise after sanding or stripping the hull you would see them. If the bottom is blistered up you’ll need to address that first (grind out, washdown/scrub several times and let it thoroughly dry )

Extreme and badly blistered boats around here get stripped down in the fall, opened up (a lot of times via soda/hydro/sandblasting) , scrubbed and scrubbed (to remove the glycol in the blister) and left that way till spring. I’ve even seen shrink wrap skirts put on the ground under and around the boats bottom with some form of heat to accelerate the drying …
Once that is all settled down, all the blisters need to get filled and faired out. After that…regardless of what you find … BARRIER COAT !!!!! If your keeping her in the water it would be foolish not to put a barrier coat on the bottom after stripping it down…a little extra time and not that much $$ to help stop any blistering . Petite and Interlux both have Barrier coats …and Interlux has lots of stuff on their website on the “how to’s”

DUNK, I would think, would have a lot of insight to this ..