There is no single best primer for wood furniture. Choose by the problem. Shellac-based primer blocks tannins, knots and odours, so it is the usual choice for oak, mahogany and cherry, and for white over dark wood. Oil-based primers are good at stain blocking and sand easily. Water-based bonding primers grip laminate and slick finishes, but they block tannins poorly.
The three main types
- Shellac-based (such as Zinsser B-I-N): blocks tannins, knots, water stains and odours, and sticks to glossy surfaces. It dries quickly, and it works under both water-based and oil-based paints. It is alcohol-based and flammable.
- Oil-based (alkyd) (such as Zinsser Cover Stain or KILZ Original): good at stain and tannin blocking, sands easily, but slower to dry and stronger smelling.
- Water-based bonding (such as Zinsser Bulls Eye 1-2-3, KILZ Adhesion or INSL-X Stix): grips laminate, melamine and slick finishes well. It is weak against tannin bleed. Check the label to confirm the formula type of the product you buy.
Choose by problem
- Tannin-rich wood (oak, mahogany, cherry, walnut): shellac-based or oil-based stain-blocking primer.
- Knotty pine: shellac-based primer on each knot, then a whole-piece primer.
- White or pale paint over dark wood: shellac-based primer, with a white primer under the white paint.
- Laminate, melamine or glossy finishes with no bleed risk: a water-based bonding primer, as used when you refinish laminate cabinet sides.
- Chalk-style paint where you want a barrier against stains: clear dewaxed shellac, such as Zinsser SealCoat, is a good barrier under chalk paint.
For a worked example on pine, see can you paint straight over pine. For dark wood, see how to paint dark wood furniture white.
Spray primers for chairs and small pieces
Aerosol versions of shellac and oil-based primers suit chairs, spindles and small pieces, where a sprayer is faster than a brush. Spray primer gives a fine, even coat, but it needs masking and ventilation like any aerosol. Read the can for the recoat time and temperature range.
Coverage and coats
Coverage typically runs around 300 to 400 square feet per US gallon (roughly 7 to 10 m² per litre), but it varies by product and surface. Bare and unfinished wood usually needs two thin coats, because the first coat soaks in unevenly. Build the coats rather than applying one heavy coat, which can sag.
Sanding primer
Sand primer with 220 to 320 grit before the paint goes on. What grit sandpaper to use on wood furniture covers the rest of the progression. This removes dust nibs and raised grain without cutting through the coat. For the final smoothing before topcoat, a finer 320 to 400 grit works well. Some spray-primer guides recommend 600 to 800 grit. Those finer grits suit a final polish, but for knocking down a primer coat, 220 to 320 is the usual range.
White or grey primer
Use white primer under white and pastel paints. Tinted grey primer helps mid and dark colours cover in fewer coats, so it suits charcoal and deep blue topcoats.
Paint-and-primer-in-one is not a primer
Paint and primer in one is thicker paint. It can be useful for some jobs, but it does not replace a stain-blocking primer. It does not stop tannin or knot bleed, and “more topcoats” will not stop bleed either. If the wood is tannin-rich or has knots, use a shellac-based primer first.
Safety
- Shellac and oil-based primers are flammable and give off strong fumes. Ventilate well, use an organic-vapour respirator, and keep flames away.
- Test older finishes for lead before you sand. In the US, paint applied before 1978 may contain lead.
- For the paint choice that goes over your primer, see which paint to use on wood furniture.