Divinylcell is a rigid PVC foam and an excellent core material. As pointed out above, it is a closed-cell foam and doesn't absorb water. However, I prefer Airex for below the waterline applications, as it is less likely to result in a hull breach in the case of an impact, being a ductile, shock absorbing foam—rather than a rigid one like Divinylcell.
Divinylcell is better used for decks and cabintops or hull topsides, which are relatively simple curvatures and do not need the impact absorption necessary below the waterline.
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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.