Allow the oil painting to dry for an extended period of time. To be safe, store the painting in a safe location where it will not be subject to dust or debris. Cover the painting with a cloth that is set above the painting for one year. The minimum you should wait is six months. Consider framing the painting for this process.
Place the painting on a flat table and remove the covering. If there is any dust, lightly dust the painting using a feather duster.
Apply a thin layer of varnish to the top of the painting using a soft bristled paintbrush. Allow the painting to sit for 24 hours and then frame your painting.