Sand lightly over a few selected areas on the face of the cupboards. Sand in one direction to create a distinct pattern of aging; sand in a random or circular fashion to create a bolder and more abstract antique look. Use differing pressures to allow the worn sections to blend or fade into the remaining paint. You can completely remove the paint in some areas, exposing the bare wood in order to create the most dramatic antique look.
Sand all of the exposed edges, giving the illusion of wear and tear over time. Sand all of the corners and areas adjacent to the corners. You can expose the bare wood over most of the edges and corners to give the most contrast and create the most character.
Mix one part water to one part paint in a plastic container. Rub the mixture into areas on the painted and sanded areas of the cupboards with a disposable cotton cloth or rag. Use reddish-browns and brownish-gray hues. Allow crevices, scratches and dents to retain darker areas of wash; this will enhance the aged look.
Seal your antiqued cupboards with low-luster polyurethane or rub-on wax sealant. This will keep the shine at a minimum, and will protect your antique finish. Use a paintbrush to apply the polyurethane, and make sure the room is well-ventilated. Apply the rub-on wax sealant with a cotton cloth or rag.