Laying fiberglass "inside" a positive part for reinforcement is a good
approach in a lot of cases. That gives you all the strength of a
composite part, but eliminates the need for lots of finish work. It
also allows you to use thinner hull materials that are easier to work with.
All of my wooden sailboat hulls are made like that,
http://pittelli.com/schooner/photos/ships/Frank/Wasa/index.html
http://pittelli.com/schooner/photos/ships/Frank/Junk/index.html
providing a plank-on-frame exterior, with a strong and waterproof
interior. The wood exterior is sealed with any number of materials
(resin, titebond, polyurethane) and is essentially waterproof, but the
epoxy-glass interior guarantees hull integrity even as the wood ages and
gets beat up.
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