uses M.D.O. Board for our wood signs
. M.D.O. Board or Medium Density Overlay, is a paintable surface made of plywood with a weather resistant resin overlay bonded to the wood by heat and pressure. The overlay, which has 27% resin content, resists water, weather, wear, and degradation.
Paint finishes on MDO are up to 3 times more durable than the same finish applied to ordinary plywood.