Once the surface is clean, the professional fills the areas with missing veneer, chipped material, or a damaged molding with epoxy putty. After the major damaged areas are fixed, your contractor removes the old finish by sanding it. For flat surfaces, a belt and disk sander will be enough,...
the old coatings need to sanded down to bare wood to prepare a clean surface for staining. Some doors have a thin veneer of wood glued to plywood which can't be sanded too much. If it needs to be heavily sanded I sometimes recommend painting the door with an oil-based high-bonding pri...