Just another Moderator
Join Date: Sep 2005
Location: New Westminster, BC
Thanked 513 Times in 487 Posts
Rep Power: 10
Treating the blister problem is a relatively simple procedure and you'll get plenty of advice from links like the above.
The biggest part of the procedure, and one that probably gets short-circuited the most is the drying out of the hull once the blisters have been opened up. This can take literally months, up to 6 or more. A good way to address this is to write off the latter part of the season, haul in the fall, seal off the boat in a tarp or shelter of some sort and keep it dry and warm over the winter. Then address the repairs in the late spring.
We did just that a few years back on a 1981 boat, used Interlux barrier epoxy, laid on 6 - 8 coats, and have not had a recurrence .