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When looking at such boats its very prudent to research the history of 'blister occurrence' for the specific boat type and mufacturer, especially if moving such a boat from salt to fresh water. Such boats will typically be those from the 70s through early 90s that have had significant historical blister problems in both fresh and especially salt water.
What happens to these boats is that because the fiberglass from that period is especially vulnerable to water permeation (both from inside the hull as well as outside) is that microscopic salts are now inside the laminate structure and by the process of osmosis will continue to migrate/permeate water and water vapor into the hull structure. Wet hulls then begin to 'hydrolyze' - the equivalent of rusting in plastics / polymers where the long chain molecules are broken into smaller chain molecules by the action of water - hydrolysis. The process of water uptake is faster and more aggressive for a such boat that is moved from salt to fresh water.

History of blister formation is the key here, especially for those 'notorious' for blistering and which are usually equally notorious for having a history of failed 'bottom jobs'.
For boats made after about the mid 1990s this problem has been significantly reduced by choosing better resins, and following better and continuous laminate lay-up practices, and of course the application of barrier coatings.

Brand specific Owners Groups on the internet are a good place to find that 'history'. Also, do be somewhat beware of boats from that era that have DIY 'bottom jobs'.
 
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