We really don't know how long a GRP hull can last. They don't really rot. The older hulls, which were often laid up with far heavier schedules than newer boats may well last 70+ years. I don't think that is true of the newer, cored construction hulls—which are subject to far more forms of degradation than the older solid laminate hull are.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.