Skipperjohn's post got me thinking.
Quite a number of years back I took a course in
aluminum casting. We used a fairly fine grained blue styrofoam used for
insulation. Stuff came in big chunks and could be glued, shaped, cut, sanded and so on with
wood working tools. We would carve up our models, pack them in sand, pour molten
aluminum down a spout and presto ... toxic gas everywhere as the aluminum replaced the styrofoam in the
mold.
A person could use this styro to produce a lovely
hull and then lay up glass and
epoxy in and out. I would think it
work very nicely for a light weight sailing or rowing dink.
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