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Ply doesn't steam well at all, even WBP or marine ply will start to delaminate after being in a steam oven.
Kerf bending is always an option but it will never look right if the kerfs are visible even if you spend ages filling and sanding it.
What is the ply faced with? Can you get the veneer without the ply? If so bent lamination (basically making your own ply from thin strips of timber in the shape you need) will probably be the way to go.
I have a faced plywood which I need to bend where the inside of the curved piece will be visible.
Can I cut kerfs and bend in the opposite direction, then perhaps fill the gaps with a 2 part epoxy filler? I would rather not have to build a box to steam.
approx. 75cm length and the curve is from a circle with maybe 3m radius, so not too much of a bend.