Don Stephan
Posts: 825
Joined: 2003-07-18
Location: Cincinnati, Ohio
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I'm not going to be able to give you an answer you want . . .
From what I saw on the Internet, Plyform is a smooth surface building plywood, so it's not designed to bend easily. In your application, there is a single layer of a non-rigid glue trying to hold two 3/8" pieces of plywood to a curve. Unfortunately, I'd expect all of the doors to "unbend" to some degree. And if that's the case, it will be faster to start over with the four doors rather than devote lots of time and effort trying to combat the unbending. The contact cement is not going to add any stiffness, and solvent stain and lacquer softened the contact cement; quite often in that application the veneer will start to slide down the doors. So after somehow pulling the door back in, it's not unlikely that the veneer will then slide.
Unpleasant as it sounds, I think in the long run the least expensive "fix" would be to make new doors with 1/4" or 1/8" plywood and a rigid adhesive like urea formaldehyde or epoxy. If it's not easy to bend 1/4" ply to the form, use the 1/8". Then, for a permanent veneer bond, glue the veneer to the plywood substrate with urea formaldehyde. Before doing so, sand the faces of the doors well, as plywood isn't always as smooth as we'd like. If there is any question, make a two ply of veneer, and before the glue cures hard attach the two ply to the door. Two ply will be less likely to allow unevenness to telegraph from the plywood to the surface of the veneer.
Sorry I couldn't give you an answer more palatable.
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