CDX plywood is ment for outdoor use. It is made with different glue, however C and D stand for lesser quality with furniture grade plywood having A and B sides. Naturally the cost is much higher for AB. If you cover CDX with batting and an old bedsheet, you will get a terrific ironing board. I nailed and glued 2" strips of plywood underneath unto 3 sides to stable it further. It fits over my regular folding ironing board OR between kitchen counter and center island.