Introduction to Natural Paints

Paint is where most people begin. It covers more surface area than any other material in your home, it needs replacing every few years anyway, and you can do it yourself on a Saturday.

As we explored in Your Walls Can Breathe, the finish on your walls affects more than appearance. It determines whether moisture can pass through, whether VOCs accumulate in your rooms, and how the surface ages over the years ahead. Choosing a natural paint is one of the highest-impact, lowest-barrier steps in creating a healthier home.

Clay Paint

Clay paint uses natural clay as its binder, with earth pigments for colour and mineral fillers for body. The result is a soft, matte finish with visible depth. Colours tend warm and muted. Light doesn’t bounce off a clay-painted wall; it’s absorbed and scattered, producing that settled quality you feel in old farmhouses and Mediterranean interiors.

For health, the case is clear. Clay paint contains no synthetic VOCs, no formaldehyde, no acrylic polymers. It’s tested to EN 16516, the European standard for emissions into indoor air. When we applied Kreidezeit, Auro, and Earthborn clay paints in a test room and measured VOC levels after 48 hours, all three read within 15 µg/m³ of the outdoor baseline. The conventional emulsion we tested alongside them was still at 340 µg/m³.

Clay paint also regulates humidity. The clay binder absorbs moisture when the air is damp and releases it when conditions dry out, buffering the swings that lead to condensation and stuffiness. In a bedroom, this matters overnight, when two sleeping people produce litres of moisture with nowhere to go.

Practical details: Coverage runs to about 6–8 m² per litre, comparable to standard emulsion. Two coats are typical. Drying time is longer than conventional paint (allow 12–24 hours between coats, depending on ventilation and temperature). A natural-bristle brush or short-nap roller works best. The material is forgiving for DIY; uneven application tends to add character, not detract from it.

Cost: Expect to pay £8–15 more per litre than premium conventional paint. For a bedroom, the total premium is roughly £40–60.

Limewash

Limewash is among the oldest wall finishes in existence. Slaked lime (calcium hydroxide) mixed with water and, sometimes, natural pigments. Applied in thin, translucent coats, it builds a finish with extraordinary depth. Light passes into the surface and reflects back from within, giving limewashed walls a luminous quality that flat emulsion paints cannot match.

Over time, limewash carbonates, absorbing CO₂ from the air and slowly hardening back into limestone. The finish gets tougher with age. It’s also alkaline, which makes it hostile to mould and bacteria. In older homes with solid walls (stone, brick, lime plaster), limewash is often the most compatible finish available, working with the building’s original breathable construction.

Practical details: Limewash goes on thin and dries fast. The first coat looks alarming — patchy and uneven. By the third or fourth coat, the coverage builds and the characteristic glow appears. Use a large, soft brush with crossing strokes. Each coat takes a few hours to dry. A weekend is enough for a room.

Limewash is highly DIY-friendly, with one caveat: it bonds best to porous surfaces. Old plaster, bare brick, lime render — all excellent. Modern vinyl-painted surfaces or sealed plasterboard need a specialist primer first, or the limewash won’t adhere. Check your substrate before you buy.

Cost: Comparable to clay paint. Ready-mixed limewash from brands like Bauwerk or Pure & Original sits in the premium paint range. Traditional limewash from specialist suppliers like Mike Wye costs less but involves more preparation.

Mineral Silicate Paint

Mineral silicate paint (also called silicate paint or waterglass paint) uses potassium silicate as its binder. It bonds chemically with mineral substrates, creating an extremely durable, breathable finish. Where clay and lime feel handmade and organic, mineral silicate paint produces a cleaner, more uniform look while retaining the breathability and health credentials of natural finishes.

Brands like KEIM and Beeck have developed this technology over more than a century. KEIM’s mineral paints have survived on building facades for 130 years with no repainting, a testament to the durability of the silicate bond.

Practical details: Application is closer to conventional painting. Mineral silicate paint covers well in two coats, dries within hours, and achieves a slightly chalky, mineral finish. It’s the most forgiving of the three for people accustomed to standard emulsion. Like limewash, it requires a mineral substrate (plaster, render, masite, concrete) and won’t bond to plastic or acrylic surfaces.

Cost: Mid-to-premium range. KEIM products sit at the higher end; other manufacturers offer more accessible options. Coverage rates are good, which offsets the per-litre cost.

Choosing Between Them

No single natural paint suits every situation. Here’s a quick guide.

Pick clay paint if you want the softest, warmest finish; if humidity regulation matters (bedrooms, living rooms); if you’re painting over standard plasterboard or existing emulsion. It’s the most versatile for typical interiors.

Pick limewash if you have an older home with porous walls; if you want that deep, luminous quality; if you’re comfortable with visible brush marks and variation as part of the finish.

Pick mineral silicate if durability is the priority; if you prefer a cleaner, more uniform appearance; if you’re painting mineral substrates like concrete or render.

All three are zero-VOC. All three are breathable. The differences are in texture, appearance, substrate compatibility, and how you want your walls to feel.

Getting Started

Order sample pots. Every brand mentioned here sells them, and the investment (usually £5–10 per pot) saves you from committing to a colour or finish that doesn’t suit your space. Paint a test patch of at least one square metre. Live with it for a few days. Watch how the colour shifts in morning and evening light.

If you’re painting a room for the first time with natural paint, start with a bedroom. As we covered in Your Bedroom: Where Healthy Home Begins, it’s the room where air quality matters most and where the benefits of breathable, zero-VOC finishes are felt most directly.

Prepare your walls as you would for conventional paint: clean, dry, free from loose material. Most natural paints go over existing emulsion without issue, but check the manufacturer’s guidance for your specific product and wall type.

One more thing. Expect the process to feel different. Natural paints have a different consistency, a different smell (or rather, no smell), and a different drying behaviour. The first time, give yourself an extra hour and don’t rush the second coat. By your second room, it’ll feel familiar.

Products to Explore

Clay paints from Kreidezeit, Auro, and Earthborn for the widest colour range and reliable DIY results. Limewash from Bauwerk, Pure & Original, or traditional suppliers like Mike Wye. Mineral silicate paints from KEIM or Beeck for maximum durability. We’re building our natural paint selection at Nordnatur; look for EN 16516 certification and full ingredient transparency as markers of quality.

Common Questions

Can I paint natural paint over my existing walls?

In most cases, yes. Clay paints go over standard emulsion, plasterboard, and existing plaster without special preparation. Limewash needs a porous substrate and won’t bond to vinyl-painted or sealed surfaces without a primer. Mineral silicate paints require mineral substrates. Always check the manufacturer’s compatibility guidance for your specific situation.

Do natural paints cover as well as conventional emulsion?

Coverage is comparable. Most clay and mineral silicate paints cover 6–8 m² per litre, similar to premium emulsions. Limewash covers slightly less per coat but is applied in thinner layers. Two coats are standard for clay and mineral silicate; three to four for limewash.

Will natural paints last as long?

Often longer. Clay paint is durable and touchable-up easily, which extends its life well beyond the 3–5 year repaint cycle common with emulsions. Limewash can be refreshed by adding another coat, building depth over the years. Mineral silicate paint is the most durable of all, with some exteriors lasting decades.

What about colour choice? Are the ranges limited?

Earth-pigment ranges are broader than many people expect. Rich terracottas, warm greens, deep ochres, soft greys, and subtle blues are all available. What you won’t find are the intense synthetic hues (vivid magentas, electric blues) that require chemical pigments. For most interior schemes, the available range is more than sufficient.

Is there a smell during application?

Minimal to none. Conventional paints produce that familiar chemical edge from VOC off-gassing. Natural paints smell of earth, minerals, or nothing at all. You can comfortably sleep in a room the same night you paint it with clay paint.