Quote:
Originally Posted by Alan Carruth
.....There is no such thing as a finish that absolutely seals out moisture. The Navy tried to find one that they could use on their wooden 'P' (personnel) and 'U' (utility) boats, which are used to shuttle people and supplies back and forth between ships and 'the beach' in ports that don't allow for docking. Even 1/4" of epoxy wouldn't do it. That's when they started to switch over to boats made from fiberglass trees.
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^^ This, and it bears emphasis. Even a thick welded steel hull needs a bilge pump. The surface finish protects from dirt and grime, but is not impervious to moisture transfer. So there is little point to finishing the inside of a guitar. The inside finish will pass moisture too.
As usual, I am quite impressed by the well reasoned background thoughts that Alan brings to his answers.