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I wondered about the life-span of fiberglass too, and based on what I discovered, I chose aluminum. Fiberglass it seems has a relatively short life expectancy.

Check this link out. http://dahlfin.com/tehani/why_aluminum.html

"According to one classification-society engineer, it''s likely that cored-composite yachts built with bottom-of-the-barrel raw materials like E-glass fabric and polyester resin will have water in the core within five years. Even more troublesome is secondary bonding: the attachment of bulkheads, stringers, floors and other structural members to the cured hull. Secondary-bonding failure is a major cause of composite boat owner''s headaches. Composite fiberglass is floating Russian roulette--do you feel lucky?"