I have painted a lot of walls badly. None of them have been more forgiving than the one I limewashed on a Tuesday in March. The wall is the entry to our flat, three metres long and tall as a stairwell, and for years it had been the same flat magnolia as the rest of the building. Limewash, in the second coat, made the wall look like a thing rather than the absence of a thing. By the third it stopped trying. By the fourth it knew what it was. I painted four because I miscounted, but four was the right number anyway.

Why limewash forgives a bad day

Standard emulsion is unforgiving. A roller leaves stripes; a brush leaves drag marks; a missed patch shows up in raking light forever. Limewash is the opposite. The brushwork is the finish. Cloudy patches are correct. A streak from a heavy hand reads as character. The first coat looks alarming, the second looks like a cloud, the third looks like a wall someone has loved.

Close-up of a limewashed wall surface showing soft cloud-like variations and faint brushwork in chalky white pigment Save
The brushwork is the finish.

Limewash is also paint that breathes. It is calcium hydroxide and pigment and water. It bonds with mineral substrates — plaster, brick, lime-render — by reacting with carbon dioxide in the air. It does not seal the wall. The wall stays able to manage moisture. In a hundred-year-old building, this matters more than colour.

What I got wrong

Three things, in increasing order of regret. First, I used a synthetic brush. The bristles drag and leave hard lines. A natural-bristle masonry brush is correct and costs ten euros. Second, I painted in afternoon sun. The first coat dried too fast and looked patchy where it should have flowed. Third, I forgot to mist the wall between coats. Limewash needs a damp surface to bond to. Dry plaster sucks the water out and leaves a powdery finish that brushes off when you touch it.

A natural-bristle masonry brush leaning against a plastic bucket of milky-white limewash, on a dust-sheet-covered hallway floor Save
Brush, bucket, mister. Everything else gets in the way.
“Limewash is paint that breathes. The wall stays able to manage moisture.” — Mira
  • Mist the wall before each coat. A garden sprayer with clean water, light pass, no puddles.
  • Paint with a natural-bristle brush, not a roller. The brushwork is the texture.
  • Three coats minimum. The first is alarming; do not panic. By coat three the wall is the wall.
  • Stir constantly. Pigment settles. A streak of unmixed pigment is a streak forever.

How to do it

Prep the wall.

Sand any glossy patches. Patch and let dry. Vacuum and damp-wipe. Limewash will not stick to gloss or grease — it will run off both like water on glass.

Prep the wall.

Mist with clean water.

A garden sprayer, two minutes of even passes. The wall should look damp, not wet. Wait five minutes for the surface to absorb.

First coat — generous.

Lay the limewash on in random arcs, not stripes. Two inches of brush at a time. The coat will look streaky and translucent. This is correct.

Second coat after 12 hours.

Mist again. Apply more sparingly. The wall starts to read as a wall, not a primer.

Third coat after another 12.

By the third coat the colour settles. Step back and look in raking light. If patches are translucent, do a fourth in those areas. There is no penalty.

Frequently asked

Can I limewash over emulsion?
Only if you prime first with a mineral primer designed for limewash. Plain emulsion is non-porous and the limewash will sit on top and rub off. Heritage shops sell the right primer for ten euros a litre.
How long does it last?
Indoor limewash is good for fifteen years. Outdoor is good for ten in a sheltered spot, five if it faces weather. It does not peel — it weathers down. You re-coat the worn patches; the rest stays fine.
Can I add colour?
Yes, with mineral pigments. Earth pigments — yellow ochre, raw umber, terre verte — work beautifully. Synthetic pigments tend to look wrong on lime. Buy from an art supplier; a small jar dyes a wall.
Is it safe over old plaster?
Old plaster is the perfect substrate. Modern gypsum plaster is fine too as long as you mist. Painted-over wallpaper is not.

In closing

The hallway looks like itself. Visitors think we plastered it; we tell them about the brush and the mister and they look unconvinced. Three coats and an afternoon got us there. The wall changes through the day — soft and warm in morning light, almost grey at dusk — and that movement is the real argument for limewash. Flat paint is a colour. Limewash is a surface.