What are the differences between MDO and MDF boards in terms of their composition and suitability for various applications?

MDO (Medium Density Overlay) boards are made of wood fibers and resin with a paper overlay, making them more durable and weather-resistant. They are suitable for outdoor applications like signs and siding. MDF (Medium Density Fiberboard) boards are made of wood fibers and resin pressed together, making them smooth and uniform. They are suitable for indoor applications like furniture and cabinetry.