I completed a project for a cribbage board/table by laminating thin strips of oak (1/8") on a 3/4" piece of plywood. I applied 3 coats of polyurethane to the oak surface and finished the underside of the plywood with a couple of coats of paint. After a few days the table started to warp, cupping in on the laminated side. What did I do wrong and can this be fixed?
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