Re: Blisters on survey - Morgan 38
Blister repairs don't 'fail' - boats get new blisters if the entire bottom isn't done. The underlying cause of blisters (which many will argue on) are not corrected by spot repairs.
The first step is to get all the old paint off so you can see blisters. Then every haul out you fix what you see, or get the whole bottom done once.
My Irwin's PO found one blister during his purchase survey - he had the whole bottom redone. That job came with a 10 year warranty, eight years ago. I'm not sweating the entire bottom falling off.
Lessons learned are opportunities earned.