.... To make a perfect job of an old varnished piece, every bit of varnish should be removed, according to directions given previously. Unless this is done the work will not be entirely satisfactory. However, it takes time to remove varnish and it may be that for the particular purpose for which the piece is to be used, it is not advisable to expend that much time. Painting may be done over the varnish, but it is never quite so sure to stick. Be sure the varnish is absolutely clean, for paint will not stick to a greasy surface. Rub with fine sandpaper or steel wool. This smooths any roughness there may be and removes any loose particles of varnish ready to cake off. It also breaks the smooth, hard surface of the varnish, and gives the paint a chance to work through and get a hold on the wood underneath.
Whether the wood is clean or whether the varnish is left on, use the flat no-gloss house paint for the first coat. If there is a dark surface to be covered by a light paint, two coats of flat paint will probably be needed. When the flat paint is thoroughly dry, add a coat of enamel paint of the color desired. Work rapidly, using as few brush strokes as possible. One secret of success in painting is in the thorough mixing and stirring of the paint. Stir until every bit of sediment has been removed and the oil is thoroughly mixed. If the sediment persists, strain the paint. In order to keep the paint in the best condition, pour out a little into a dish for use. When more is needed, stir thoroughly before removing from the can. This leaves the paint in the can fresh and clean.