MDO, or Meduim Density Overlay plywood is coated with a very smooth paper (water resistant phenolic) overlay, which provides excellent paint adhesion with less drip and minimal if any grain transfer. MDO's plywood core is very stiff, strong and durable and will provide years of service if maintained properly. Our primed MDO is faced on 2 sides, and sold in ⅜ in., ½ in., and ¾ in., 4 ft. x 8 ft. sheets. We also carry MDO in ½ in., and ¾ in. 4 ft. x 10 ft. sheets.