Here is the what I just posted on THT and what I found out:
I have been asking because my main issue is wet stringers in my 1992 Cruisers Esprit. AND I did confirm that this is NOT a vacuum ("hot vac") type product. It is dry (< 2% RH), warm air being introduced into the problem areas at about 2 PSI. Not a dehumidifier, but they are somehow taking the moisture out of the ambient air. No peeling, works on any irregular surface, such as stringers, bulkheads, etc. On stringers the engines, generators, etc stay in the boat when they dry them out. On wet coring, they can go after it from the inside(not always, but that is there first choice) so it doesn't even impact the gel coat. I was given references on stringer jobs they have done.
OK, so here is the interesting thing I was told today by a design engineer at a major boat builder:
There are times stringers can be rotted out completely and it will not affect the strength or integrity on some boats at all, in fact it could be the opposite.
It all depends on how the wood is used. If the wood is only used as a form to wrap the glass around, and the layers of fiberglass (and how they attach/bond to the hull itself) are designed to be the strength, then, from a structural strength standpoint, anything that interrupts how all the layers were laid in and (how they all bond together in the original layup done in the mold) can weaken the engineered design. He compared it to uni-body construction in our cars. He did however say that if the fiberglass has actually cracked and/or collapsed, that is another issue.
And I think he was being sarcastic when he said "and of course anytime they survey wet, then wet stringers are definitely a problem"
