This article mentions something I had been thinking would be very helpful in the survey
phase of boat purchase
; a coring of the hull
below the waterline or at least a "peeling" of the barrier coat and/or gelcoat
. I doubt an owner would ever agree to allow a surveyor
or potential buyer to do that. I had thought in lieu would be to remove a through hull
fitting to permit inspection
of the lay-up yet this too is addressed as shown below.
Blister & Laminate Hydrolysis in Fiberglass Boat Hulls
"We are often asked about removing thru-hulls prior to peeling and relaminating. Though fine in principal, the actual work is far more expensive than is justified by the results. Removal
and reinstallation of thru-hulls runs $30-$40/ft plus materials (parts are often broken during disassembly). We have seen no evidence that not removing thru-hulls results in failure around thru-hulls and considering the high cost, removal
seems a superfluous luxury."