Yes, chalk-style paint usually adheres to clean varnished, lacquered or shellacked wood. Clean the surface thoroughly, test a small area, seal any tannin-rich wood with shellac, and then paint and seal the finish. Skipping the cleaning or the test is the most common reason it fails.
Clean first
Clean with sugar soap, a TSP substitute or a degreaser, then rinse and let the wood dry. Grime and polish cause poor adhesion. Silicone-based furniture sprays are a particular problem, because they cause fisheyes where the paint pulls away. A coat of clear shellac over the cleaned surface acts as a barrier against silicone residue.
Test adhesion before you commit
Paint a small area of the piece, let it dry for 24 hours, then press a strip of tape on it and pull it off firmly. If paint comes away with the tape, the surface needs more preparation. Scuff-sand, clean again and retest. This takes a day, but it saves you from repainting a whole piece.
Scuff-sand glossy finishes
Very glossy or slick finishes, such as high-gloss polyurethane or lacquer, need a light scuff to grip. Use 180 to 220 grit, wipe away the dust, and paint. Dull the sheen, but do not sand back to bare wood unless the varnish is failing.
Stop tannin bleed
Mahogany, oak and cherry often bleed tannins through a light paint, showing as yellow, pink or brown stains. The bleed sometimes does not appear until a water-based topcoat is applied, so test the area before you finish the whole piece.
Stop it with one or two coats of clear dewaxed shellac, such as Zinsser SealCoat, or a shellac-based primer such as Zinsser B-I-N, before you apply chalk-style paint. Coats of chalk paint on their own will not block tannins; the stain keeps coming through until it is sealed.
Remove wax first
Chalk paint does not stick to wax. If the piece has been waxed, remove the wax first with white spirit or mineral spirits and a fine abrasive pad. Wipe with a clean cloth and let it dry before you paint. Skipping this step is a common reason for patchy adhesion.
Failing varnish
If the varnish is peeling or flaking, paint will not fix it. Sand or strip the loose areas, clean, and then decide whether to prime and paint. How to strip varnish from wood furniture safely covers the stripping route. Paint over loose varnish will lift with it.
Paint and seal
Apply two coats of chalk-style paint, letting each dry for about one to two hours (the time varies with brand and conditions). Then seal the piece with clear wax, or with two to three coats of water-based lacquer or polycrylic on tops and other surfaces that take wear. Water-based topcoats are less likely to yellow light colours than oil-based ones.
Check for laminate and veneer
Many shiny surfaces look like varnished wood but are laminate or veneer. Laminate is plastic-based and needs a bonding primer even with chalk paint. Veneer is thin real wood, and it can be sanded through quickly, so scuff it lightly. The guide to painting veneer furniture covers the difference in more detail.
Safety
- Test older finishes for lead before you sand, especially on older pieces.
- Shellac primers are alcohol-based and flammable. Ventilate the room and keep flames away.