Limewash is a mineral lime-based paint that gives walls a characteristic living patina and depth that synthetic coatings will never achieve. This guide will walk you step by step through the application — from substrate preparation through tool selection to the number of coats and typical mistakes to avoid.
The guide draws on the technical specification from Bauwerk Colour, with whom the epix+ brand has a long-standing partnership, and adds practical experience from Czech projects.
What is limewash and why do tradespeople choose it
Limewash is created by mixing slaked lime (calcium hydroxide), clay, and natural pigments with water. It is not a “paint” in the conventional sense — it behaves more like a mineral layer that bonds chemically with the substrate. As it dries, it carbonates, converting back into calcium carbonate and forming a vapour-permeable microcrystalline structure.
For tradespeople and applicators, this brings several practical advantages:
- The wall breathes. The layer is 100% vapour-permeable, so it does not trap moisture inside the structure. You will appreciate this on heritage building renovations, straw-bale construction, and modern passive houses alike.
- It will not peel or blister. The bond with the substrate is chemical, not mechanical, which eliminates the typical failures of dispersion paints.
- Neutral static charge. Limewash carries no electrostatic charge, so it does not attract dust. Walls stay cleaner for longer.
- VOC-free. No solvents, no fumes. Suitable for allergy sufferers and for work in occupied spaces.
- UV-stable. Mineral pigments hold colour for decades without fading.
Limewash works on modern and traditional projects alike — from minimalist interiors to historic façades of brick, stone, or adobe blocks.
Substrate preparation: the most important step
A poorly prepared substrate will ruin even the highest-quality lime paint. The process differs depending on the type of surface, so we will go through it scenario by scenario.
New or repaired plasterboard and plaster
Nothing can be cut corners on here. Proceed as follows:
- Apply 2 coats of a quality water-based primer intended for plasterboard or plaster. The primer ensures even absorbency across the entire wall surface.
- Do not dilute the primer or use a mist coat. Full coverage is essential.
- Once dry, apply 1 coat of BAUWERK Prep Coat as the adhesion layer beneath the limewash itself.
Without this step, “ghosting” appears — areas with differing absorbency show through the finished coat like spectres.
Walls previously painted with dispersion paint
Limewash and Prep Coat cannot conceal what lies beneath them on the wall. If the wall has repairs, stains, or damage, these will telegraph through the final coat.
- Repairs and stained areas: 2 coats of dispersion primer → 1 coat Prep Coat
- Walls in good condition, properly primed: 1 coat Prep Coat is enough
- Walls with sheen (high gloss, semi-gloss): sand lightly first, then Prep Coat
New brick, lime or cement render
These substrates are ideal for limewash. No undercoat is needed. The procedure:
- Lightly dampen the surface with a fine mist spray so that the wall does not pull water from the paint too quickly
- Protect all surrounding surfaces, especially absorbent materials
- Lime render: no curing time, you can paint immediately
- Cement render: allow 7–15 days to cure before application
- It can be applied even on a damp surface
- For façades, 3 coats are recommended, using a large natural-bristle brush
Old brick and render
- Brush off any loose particles
- Carry out repairs using a material similar to the surrounding substrate
- If the wall was previously coated with Bauwerk limewash, 1–2 refresh coats are enough — the new layer of lime strengthens the previous ones
- After rain, do not paint onto a saturated surface; let it wind-dry first
Tools: it will not work without the right brush
There are no surprises here — limewash demands a large natural-bristle brush. Bauwerk and other manufacturers offer specialised brushes with an ovalbond head that holds plenty of paint and allows free, long strokes.
What you will need:
- A large natural-bristle brush (never a synthetic roller)
- A stick blender or whisk — the paint must be thoroughly mixed and stirred regularly
- A bucket or container to decant the paint into (never paint from a full pail)
- A sprayer with a fine nozzle to dampen the substrate
- Drop sheets and masking tape
- Rubber gloves, eye protection, and a barrier cream for your hands
The brush must be dry before you start work. Wet bristles will dilute the paint unevenly and produce a patchy finish.
Application step by step
Here is the procedure as the manufacturer recommends it — and as hundreds of real-world projects have confirmed.
1. Stir the paint thoroughly
Use a stick blender or whisk. The pigment settles at the bottom, and if it stays in the bucket, the finished wall will show colour drift.
2. Decant into a smaller container
Work with only about 8 cm (4 inches) of paint in your bucket. A full pail is heavy, awkward to handle, and the paint inside separates quickly.
3. Load the brush, flick off the excess
The brush will hold plenty of paint, but it must not drip. Stir the paint regularly — ideally after every reload.
4. Spread the paint with free strokes
The key rule: stretch the paint as far as it will go, in a single direction, with free long strokes. Limewash is transparent when wet — coverage will look thin and you will be tempted to apply more. Do not do it. Once dry, the layer lightens, closes up, and becomes opaque.
5. Maintain a wet edge
Work so that you always blend into a still-wet edge. The moment a dry line forms on the surface, the finished wall will show a visible darker overlap.
6. Do not start patching
Do not return to dried areas. If a patch or missed spot appears, deal with it on the next coat — patching dried paint will always be visible.
7. Wait between coats
Limewash is touch-dry in 1–2 hours. In cold and humid conditions, allow longer — up to a full day between coats.
8. Apply 2–3 coats
Interior usually needs 2 coats, façades require 3. Limewash reaches full strength only after two weeks of carbonation.
Coverage: how much paint to order
Limewash coverage depends on the absorbency of the substrate. Plan as follows:
| Substrate | Coverage per litre / per coat |
|---|---|
| Unpainted absorbent walls | 7–10 m² |
| Walls with Prep Coat | 10–15 m² |
| Standard previously painted walls (properly prepared) | 15–20 m² |
Treat these figures as a guide — the porosity of a specific surface can shift consumption significantly. We always recommend testing on a sample first (Bauwerk supplies 250 ml sample pots) so that you can see the colour in the given light and measure the real consumption.
Temperature, weather, and when not to work
Limewash is a living material and has its preferences:
- Ideal temperature: 8–30 °C (both air and wall)
- Do not paint below 5 °C — the paint will not react correctly
- Exterior: ensure 3 days without rain after application
- Do not paint onto a saturated surface after rain
- Avoid direct midday sun on façades — the paint could dry before you have spread it out
During construction or renovation, schedule painting as the last trade. Plaster dust and adhesive residues from other trades will affect substrate absorbency.
Safety: limewash is caustic
The base material of limewash is calcium hydroxide (Ca(OH)₂). Although heavily diluted in the finished paint, the manufacturer classifies it as a caustic substance. Prolonged contact breaks down the natural oil barrier of the skin.
Always use:
- Rubber gloves
- Barrier cream beneath the gloves
- Eye protection
- After work, wash your hands thoroughly, especially before eating
First aid:
- Skin: rinse with plenty of soapy water
- Eyes: flush with plenty of water and see a doctor immediately
- Ingestion: drink water and see a doctor immediately
5 most common application mistakes
- Overloading the brush. The most common beginner mistake. Trying to “cover” the transparency of wet paint produces white patches on the finished wall.
- Painting from a full bucket. Pigment settles, the paint loses homogeneity, and colour drift appears.
- Skipping Prep Coat on plasterboard. Without it, ghosting appears and the wall looks patchy.
- Patching dried areas. Always visible. Deal with it on the next coat instead.
- Application in the wrong conditions. Below 5 °C, onto a sun-baked wall in summer, onto a saturated surface after rain — all disastrous.
Cleaning and disposal
- Wash brushes and tools in mildly soapy water, away from food preparation areas
- For spillage, cover with sand, wash with clean water, and finish with a weak vinegar solution
- Let leftovers evaporate — the remaining cake is an inert lime material and can be disposed of in normal household waste
- Store in an airtight container in a cool, dark place, in a container matching the volume (this limits oxidation)
FAQ: what tradespeople ask most often
Can limewash go over an old dispersion paint?
Yes, but only over Prep Coat. If the wall has a sheen, it must first be lightly sanded.
What is the difference between limewash and the lime paint from a hobby store?
Professional limewash has better pigmentation, more stable chemistry, and finer granulometry. Cheap products often peel, fade, or carbonate poorly.
How long does limewash last on a façade?
With correct application and a quality substrate, 15–25 years. A refresh of 1–2 coats restores the appearance without the need to strip the old paint.
Can limewash be used in a bathroom?
Yes, but only outside direct water spray. For shower enclosures, choose microcement with a waterproof sealer instead.
Can it be applied with a roller?
No. A roller destroys the characteristic texture that is the whole reason for using limewash. Always a natural-bristle brush.
Does it dry as fast as dispersion paint?
Touch-dry yes (1–2 hours), but full strength takes 2 weeks of carbonation to develop. Treat it gently until then.
Get started with limewash from epix+
At epix+, we supply premium decorative finishes including limewash in an extensive colour palette. For tradespeople and applicators we offer:
- B2B partner portal with wholesale prices and a loyalty programme
- Personal pickup at our showroom or warehouse at Branická 26/43 in Prague
- Technical consultations for non-standard projects
- Samples to test on your specific substrate
Do you have a specific project and are not sure how to proceed? Contact us and we will go through the details together.
Useful resources
- Bauwerk Colour – limewash paint technical specification
- ČSN EN 459-1 – Building lime (standard for lime products)
- epix.design – limewash colour catalogue
