Paint the Cabinet Units
Once fully assembled, paint the cabinet units using a color that matches or coordinates with the existing kitchen cabinetry.
Use sandpaper or an abrasive pad and brush across the surface of the painted surface. The idea is to lightly remove some of the paint to make it a thinner coat in some spots. It's OK for the white primer to partially show through in some areas.
Use a tack cloth or rag to remove any dust residue, and then use a water-based dark glaze to coat the surface of the doors. Wipe the glaze on lightly with a rag. A weathered finish can be achieved using a slight contrast between the paint color, the white of the primer underneath and the darkness of the glaze. The degree of darkness can be customized to taste depending on how much glaze is applied. Allow the glaze to dry fully.
If you're painting cabinet doors, painting is easier with the doors off. Install them once the paint is fully dry. To create a custom glazed finish, first prime and paint the doors. Allow the paint to dry fully.