On Apr 19, 8:05 pm, wrote:
Trying to bend it with the grain (grain parallel to the bend
line) will usually fracture the core plies, since it's pretty hard to
get moisture that deep.
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Try adding two ounces of household ammonia and ONE DROP of liquid
detergent (or a drop of Kodak 'Photo Flow') to each GALLON of water.
Soak over-night then heat the soaked wood to 165 to 185F degrees.
Bend to the desired shape and allow to dry. For extremely deep
curves, do the bend in graduated stages, keeping the plywood moist
until the desired shape has been achieved.

Thinner is better; make the part as two shells if needed to achieve
the desired thickness.

This procedure does not work with all plywoods.

-R.S.Hoover