Can I Use Varnish Over Semi-Gloss Paint?

Considerations

• Varnish acts as a clear, protective coating on top of your paint shade. The clear varnish adds a small or high amount of shine to the finished piece, depending on the type used. Varnishes are typically safe for use on top of stains or paint, including semi-gloss paint. Semi-gloss paint contains a small amount of shine and is safe for both indoor and outdoor use. The paint is not as dull as matte or flat paint, but not as shiny or glossy as high-gloss paint.

Applying Over Paint

• When working with clear varnish, completely sand your work surface. Wipe off any dust or debris and apply a layer of primer. If you choose a darker paint color, then pick a tinted primer. Tinted primers add a small amount of color, which reduces the amount of paint needed for a richer and darker color. Paint as many layers of semi-gloss paint as you want on the piece, letting each layer dry. Paint the varnish on top of the paint color and let dry. If you use more than one coat of varnish, then lightly sand each layer before painting.

Expert Insight

• Ron Joseph of Paints & Coatings Resource Center recommends testing the varnish on a small area before painting all over. Apply the varnish and watch for any signs of peeling, blistering, cracking or any other damage. If the piece retains its original look, then let the varnish dry for a few days. Cut a small “x” on top of the varnish. The varnish should adhere to the paint and not come loose or peel away from the piece.

Warning

• When choosing a varnish, look at the manufacturer’s recommendations and pick one designed for your job. Long oil varnishes are more suitable for indoor projects because the varnish contracts and expands as the wood does. Short or medium oil varnishes are more brittle and less flexible, which means the coating does not expand and contract in the same way. When you use a medium oil varnish on a table for example, the varnish may crack and appear brittle on the wood.