Painted finishes use a combination of hardwood and furniture board to achieve a product with superior stability, consistency, coverage, and durability. Furniture board consists of engineered wood such as Medium Density Fiberboard (MDF), High Density Fiberboard (HDF), particle board or other man-made wood products. Painted door features include: Joint lines caused by the natural expansion and contraction of wood The natural aging process that may change the tone of paint colors over time