We hauled ours last year, found a quite a few what looked like blisters, but generally looked good, slipway suggested wet blasting all old antifoul off so we could see what we were dealing with, as you can see from the photos, it was not what we had expected, even the slipway foreman was suprised. Many years of PO repairs
. will be a lot of grinding out and glassing, some were repaired properly but 75% were just quick fixes.
As you can see from one of my photos I have circled a blister, bulges out and when opened up oozes a sticky smelly liquid. The wet sand popped most of them the others we opened up, have washed a number of times, and she has been drying out ever since (whilst I refit
interior) you might be suprised what you find under yours.