If the cabinets need to have any repairs or In case you have any holes to fill you would like to use wood filler and make your repairs just before sanding. If the cabinets are more mature or For those who have a textured wood grain then I'd personally suggest http://paint-my-cabinets15791.full-design.com/5-Simple-Statements-About-how-to-prep-cabinets-for-enamel-painting-Explained-43926508