If you look at boats older than a certain vintage, Pre-Vinyl Ester, they will almost certainly have blisters. In the early days it was not understood how bad dry layup
could be. Polyester was especially bad for this. Certain makers are also known for blister problems. You may find only gel coat tiny blisters. These are small and easy to fix but usually in great quantity. Real serious delamination
is a deal breaker. If you decide to get one of these I suggest you simply plan to have it peeled or diy. The standard procedure in the north is to peel in the fall and let it stand bare all winter. There are good epoxy
resurfacing programs and you can do this yourself but it is a lot of work. We were out of water
for three years but our refit
included way more than a new bottom. I think that in the present economy there are a lot of recent vintage good boats available. A restoration
needs to be a labor of love for some eye-popping classic. You will not likely get your money
back out of it. I noticed last season that fully half of the boats stored at Torresens in Muskegon did not go in. Many are available.
Mahina Expedition - Selecting A Boat for Offshore Cruising
I listened to a few lectures by the Neals in Chicago at the sail show in January. They offer a service
to help locate the boat to best suit your offshore
needs. Perhaps you might find it useful.