Do I need to sand and wax chalk paint?

Chalk and mineral furniture paints are high-pigment, low-sheen, highly absorbent paints with an unusual ability to grip on a lightly prepared surface. That grip is real and it is why the products became popular, but it was never universal, and the film they leave is soft and porous, which is why sealing is not optional. Almost every disappointing chalk paint job is one of those two facts being ignored.

Step by step

1. Clean everything, however good the paint is.Furniture carries polish, wax, silicone spray, kitchen grease and hand oils, and no paint bonds to any of them. Wash with sugar soap or a degreaser, rinse, and let it dry completely. This step is never optional and skipping it is the single biggest cause of chalk paint peeling.
2. Sand only the surfaces that need it.Bare or previously matt-painted wood: no sanding needed. Old gloss, varnish, melamine, laminate, plastic and anything shiny: abrade it so it is no longer glassy, and on melamine or laminate use an adhesion primer as well. The claim is 'no sanding on most surfaces', not 'no sanding'.
3. Seal anything that might bleed.Old mahogany, oak and some stained pieces release tannin or dye through chalk paint as pink or brown patches, often on the second coat. A stain-blocking primer or a coat of shellac under the paint stops it. Test an inconspicuous area first if the piece is old and dark.
4. Apply thin coats and let each dry.Chalk paint goes on thick easily and looks textured when it does. Two or three thin coats give a far better surface than one heavy one, and the paint dries fast enough that this is not a slow process. Sand lightly between coats with a fine abrasive if you want a smooth rather than a brushed look.
5. Choose the sealer by how the piece will be used.Soft wax gives the traditional look and a lovely feel, is easy to repair, and is right for a bookcase, a bedroom chest or a decorative piece. Clear acrylic lacquer or a furniture varnish is far more durable and water-resistant and is the correct choice for a kitchen table, a bathroom cabinet, a hall bench, anything with children near it, and any surface that gets wiped.
6. Apply wax the way wax wants to be applied.A thin coat worked into the paint with a cloth or wax brush, all excess wiped back off within a few minutes, then buffed once it has hardened. Wax left thick stays soft and sticky and picks up dirt. Two thin coats beat one thick one, and it takes weeks to reach its full hardness.
7. Know that wax is a one-way decision.Once waxed, nothing else will stick to that surface — not more paint, not lacquer — until the wax is removed with white spirit or a wax remover, which is a tedious job. If there is any chance you will want a harder finish later, use lacquer now.

Tips

• Dark wax over clear wax is how the aged look is achieved, and it grips much less predictably if it goes on bare paint. Clear first, then dark, working small areas.
• A chalk-painted piece that gets used will show wear at the edges and handles first. That is part of the look for some pieces and a nuisance for others — decide which before choosing the sealer.
• You can make a serviceable chalk-type paint by adding a plaster or calcium carbonate additive to matt emulsion. It handles similarly and still needs sealing.

Common mistakes

• Skipping preparation because the tin says no sanding needed — The claim covers adhesion to sound matt surfaces. Grease, silicone polish, gloss and melamine all defeat it, and the failure shows as paint lifting in sheets months later.
• Waxing a kitchen table — Wax is not water-resistant and marks with anything hot, wet or oily. Lacquer that surface instead — and remember wax cannot be lacquered over later.
• Leaving wax thick and unbuffed — It never hardens properly, stays tacky, holds dust and fingermarks, and looks worse over time rather than better.

Questions people ask