One of our regulars, who is a bit shy about himself and his boat, asked me
some questions privately that I can't amswer. My experience and knowledge
concerning fiberglass boats is pretty much limited to owning one.
Professionally, I'm a metal boat designer.

Now, I'd like to know the answer.

If you have your boat surveyed and the moisture meter shows high readings in
an area of cored deck that otherwise seems solid, is that really a problem?
How can the meter read moisture in the core under 1/8 to 1/4 inch of
fiberglass and determine that it is not just surface moisture? Do these
gadgets have anything useful to tell you about fiberglass condition? Are
they any use on a solid glass hull?

When I was looking for my E 32, which has solid glass decks with plywood
bonded underneath in critical spots, I didn't look at one that the broker
said had some high moisture readings in the decks. I've often wondered just
what that meant. The boat we ended up buying was reported to have very dry
decks so I didn't give the subject any further thought until this.

--
Roger Long