Sorry to hear about your problem. If that is the direct response form the surveyor it does sound that bad. I would guess that over 50% of the boats out there suffer or have had that problem. One of the reading sources is the West System guide to "GELCOAT BLISTERS". You can get if from just about all the boat supply houses, West Marine, Boaters World, U.S.Boat. This gives a good theory as to what has occurred.It also explains how to deal with it. I would also check your browser for fiberglass and read some of the online material that other manufacturers have. West System is good and I think that Interlux 2000 is a good barrier coat after the work is complete. For your immediate consuling, The process involves opening the blisters, and letting the hull dry out. This can take a while but heat and dehumidification can speed the process. I think that just about anyone can take this project on . Pop the blisters ( they are under pressure, expect them to pop). Grind all the loose gel coat awaydown to the laminate. As Don advised, if you find that it is a deeper problem get a professional to repair the laminate. Chances are that most of the blisters will be gel coat. You can prep all the blisters then ask, PAY a professional to look over your work then wait...until the moisture level has dropped. It will never be completely dry but there is a moisture content that you are shooting for. Before filling the blisters, wipe with acetone ( to remove residue) and spot sand the blisters and wipe with acetone again. Mix the epoxy (easy and more water resistant) or polyester and fill the blisters with a slight bulge. Wait for cure and sand fair to the hull. Remove all old bottom paint and sand the hull and apply atleast two coat of Interlux 2000 barrier coat then bottom paint. Good luck r.w.landau