Yes, milk paint works on bare wood
Milk paint was made for wood. Historically it was used on colonial American and Shaker furniture. It bonds best to raw, unfinished, or stripped wood. On wood that already has varnish, lacquer, or paint, the bond is unreliable, and the paint is likely to chip.
What milk paint is made of
Milk paint is a powder made of casein (a milk protein), lime, chalk or clay, and earth pigments. You mix it with water. It is sold as a powder, which means you mix only as much as you need.
Raw, unfinished, or stripped wood
On raw or stripped wood, milk paint soaks in and bonds well. You don’t need a primer. The thin first coat soaks in, and two or three coats build the full color.
The first coat may raise the grain. Sand lightly with 220 grit between coats, then wipe away the dust. Recoat after about 30 minutes to two hours, depending on humidity and the brand.
Finished wood: sand or add a bonding agent
Varnished, lacquered, or painted wood is a different story. Milk paint adheres poorly to finished surfaces, so expect chipping. You have two options.
- Sand to bare wood. Remove the old finish until you reach bare wood, then paint. On a thick varnish, stripping the varnish safely first saves a lot of sanding. If the piece was painted before 1978 in the US, test the old finish for lead before you sand, and wear a dust mask.
- Add a bonding agent. Products such as Miss Mustard Seed’s Bonding Agent or OFMP Extra-Bond are mixed with the paint, often about 1:1. Check the brand’s instructions.
Some people want a chipped look, but on finished wood it is hard to control where the chips appear.
Oily and tannin-rich woods
Oily woods such as teak and rosewood can resist paint. Wipe them down with mineral spirits or denatured alcohol first, and let them dry before you paint.
Tannin-rich woods such as oak and mahogany can bleed through. Shellac can block that bleed, but it also stops milk paint from bonding to raw wood. Test on a hidden area first and weigh the trade-off.
Mixing and applying
- Mix powder and water at roughly 1:1 by volume, though this varies by brand. Check the label.
- Let the mix sit for 10 to 15 minutes, then stir often while you work, because the solids settle.
- Apply thin coats, and use two or three for full color.
Sealing milk paint on wood
Unsealed milk paint is sensitive to water and stains easily. Seal it with hemp oil, tung oil, furniture wax, or a water-based polyurethane. Oils darken the color, so test on a sample first.
For cabinets or other pieces that take heavy daily use, water-based polyurethane is the most durable option. The kitchen cabinet guide covers topcoat steps.
How long mixed milk paint lasts
Mixed milk paint doesn’t keep long. Expect it to last about a day at room temperature and a few days in the refrigerator, depending on the brand. Mix only what you will use in a session, and check the label for the brand’s guidance.
Common milk paint myths
- Milk paint always chips. Chipping happens on finished surfaces, not on raw wood.
- Any paint called milk paint is casein-based. Some products are acrylic. General Finishes Milk Paint, for example, is a premixed acrylic.
- Milk paint is waterproof once dry. It needs a sealer for wet or high-use areas.
- Mixed milk paint keeps like canned paint. It doesn’t, so mix small batches.
For how milk paint compares with chalk paint on cabinets, see the chalk vs milk paint comparison.
Safety
Wear a dust mask when you mix the powder. Lime irritates the eyes and skin, so wear eye protection and gloves.