H.W.,

  So you'd say XPS deserves a place in boatbuilding the way balsa core does -- best perhaps for decks and cabintops, and less-than-optimal for hulls and topsides?

  That would be a reasonable compromise.

  Then, some folks will still go with balsa, or perhaps XPS, for the rest of the boat because weight means more to them than resiliency.  Which is, of course, each builder's trade-off to decide upon.

  Just out of curiosity, do you know how a sheet of XPS would handle the infusion process with curves?  The building process for the Solitarry is pretty wild, at least in terms of what can be done ahead of time:

    https://www.youtube.com/watch?v=DfhdRfBTt8o

  I've never worked with XPS under 4", so I don't know much about its flexibility.

        - Mike

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