Using a chip brush, paint the entire exterior with a light base-coat color in a flat finish. Go in the direction of the grain, but you don't need to be too fussy about the brushstrokes. Once the base coat is dry, lightly apply a darker top coat, again in a matte finish. Be careful not to overload the brush.
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Medium-grit sanding sponge
3 disposable chip brushes
1 quart of primer for the interior2 quarts of latex paint for the exterior