Still cracked. I am going to go with bending birch plywood and epoxy.

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Dick Snyder wrote:
I tried cutting the interior side of one of the pieces of plywood with a
utility knife. When I tried to bend the plywood it just cracked at one of
the cuts. Maybe I will kerf it to see if that works any better.

It should work bettter as a kerf removes material so that there
is less tension on the convex side.

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FF