I picked up 4 @ 5' x 5' x 18mm sheets of Baltic Birch plywood from a local supplier for a cabinet project in my dining room. I didn't notice that the plywood wasn't completely flat until I got it back to my shop. When I hold a 6' straight edge across the diagonal I get about 1/2" bow from the center to each corner on the worst piece (1" from corner-to-corner). Is this acceptable or should I return the warped/bowed pieces for flatter pieces? I need to make 3 cabinet boxes at 40" width x 31" height x 14" depth. I'm concerned the bow in the plywood will make it difficult to square up the boxes. I should have looked more carefully at each piece of plywood before purchasing, but didn't think this type of plywood would be like this.
Thanks for any comments,
Chris