Sand the furniture to remove any imperfections, such as nicks and scratches, on the surface. Sanding also removes any of the old, worn paint that may show in the new finish. Sand one section at a time, using a back and forth motion, until the surface is smooth and the old finish is removed.
Wipe the furniture with a damp cloth to remove dirt and debris left by sanding. Dirt and other contaminants can keep paint from adhering properly to the furniture. Pay careful attention to remove debris from corners and crevices in the furniture.
Prime the furniture with an oil-based primer. Other primers, such as latex, are not compatible with oil paints and, if used, will cause paint failure in the new finish. Primers seal porous surfaces and make the painting area smooth for the new paint coat. Using primer is especially important in coffee and kitchen tables where moisture from drinks and plates has a greater chance of getting on the surface. Wait for the primer to dry before applying paint.
Use a high quality paint brush to apply your oil-based paint. Low quality brushes fall apart easily and leave paint streaks across surfaces. Oil-based paints tend to be stickier and do not spread as easily as other paints, so work the paint into the surface in an up and down motion until the furniture is coated. Oil paints are very durable but take a long time to dry, so be sure to let the finish dry before adding another coat, or before you use your furniture.