kevlar canoes are not stiff. they have lots of bulky foam core ribs on the
inside so the boat will keep it shape. the ribs are a bother when trying to
kneel and paddle. most "kevlar" canoes are a combination of materials with
kevlar in the places where its most beneficial

I've seen a book in which a one-off female mould was made by laying strips
of cheap foam over station moulds and fairing with some kind of putty. Then
the resin and glass were laid up in the nomral way.

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