How to paint lime plaster: preparation, paint and application

Lime plaster has been used in buildings for centuries, valued for its durability, versatility and ability to manage moisture. Found in many period properties, it creates a beautiful surface with a distinctive character.

But decorating lime plaster requires a little more care than painting conventional gypsum plaster. From allowing new plaster to cure to choosing a suitable breathable finish, understanding the material is essential to achieving a lasting result.

Here’s what to consider before painting lime plaster.

Why does lime plaster need breathable paint?

Lime plaster is naturally porous and vapour permeable, meaning it allows moisture vapour to pass through the surface.

This is particularly important in older buildings, where traditional materials such as lime mortar, stone and brick help manage moisture through absorption and evaporation.

Choosing a compatible, breathable paint allows the plaster to retain its vapour permeability. A coating that significantly restricts moisture movement may contribute to peeling, blistering or deterioration, particularly where damp is already present.

For more on the importance of breathable finishes, read our guide to breathable paint for period properties.

How long should lime plaster dry before painting?

Fresh lime plaster needs sufficient time to cure and dry before it is decorated.

Unlike gypsum plaster, lime hardens through a process called carbonation, reacting with carbon dioxide in the air over time.

The time required before painting varies depending on the type and thickness of plaster, temperature, humidity and ventilation. It is important not to rush this stage.

Before decorating, check that the plaster is ready to receive paint and follow the guidance of your plasterer and paint manufacturer. A surface that feels dry to the touch may not yet be sufficiently cured.

How to prepare lime plaster for painting

Good preparation is essential, whether you’re decorating freshly plastered walls or refreshing an existing lime-plastered surface.

1. Check the condition of the plaster. Look for loose or damaged areas, signs of damp and any existing coatings that may affect adhesion.
2. Remove loose material. Gently brush away dust and friable material without damaging the plaster.
3. Repair imperfections. Use a filler or repair material suitable for lime plaster and the intended paint system.
4. Check the surface is ready. Make sure any repairs have cured and the plaster meets the paint manufacturer’s requirements before applying the first coat.

Avoid applying sealers, primers or other treatments without checking their compatibility with the plaster and chosen finish.

What is the best paint for lime plaster?

A breathable paint with suitable vapour permeability is generally the preferred choice for traditional lime-plastered walls.

Limewash and distemper have historically been used on these surfaces, while some modern breathable formulations can also be appropriate.

At Edward Bulmer Natural Paint, our paints are made using plant-based binders and carefully selected earth and mineral pigments. Our approach combines natural ingredients with an understanding of traditional building materials.

When choosing a finish, it’s important to check that the specific product is suitable for your plaster, particularly if it is newly applied or has previously been decorated.

How to apply paint to lime plaster

Once the plaster has been properly prepared, the next step is to apply your chosen finish according to its technical guidance.

1. Check whether a primer or diluted first coat is needed

The correct first coat depends on the condition and absorbency of the plaster and the paint being used.

Some paint systems require a specific primer or diluted first coat, while others should be applied differently. Always follow the instructions for your chosen product rather than assuming that lime plaster needs a conventional mist coat.

2. Apply the paint evenly

Use the brush or roller recommended for your paint finish, working methodically across the surface.

Avoid overloading the applicator and follow the manufacturer’s guidance on coverage and application.

3. Allow sufficient drying time

Observe the recommended drying and recoating times before applying subsequent coats.

Temperature, humidity and ventilation can all affect drying, so allow additional time where necessary.

4. Check the finished surface

Once the paint has dried, inspect the finish in natural and artificial light.

The texture of lime plaster can contribute to the character of a room, particularly when finished in a colour made with natural pigments.

Caring for painted lime plaster

Maintaining lime-plastered walls begins with understanding the building and keeping an eye on any changes in the surface.

If paint begins to peel or blister, investigate the underlying cause rather than simply covering the affected area with another coat.

In period properties, identifying sources of moisture and using compatible materials for repairs are particularly important for long-term maintenance.

Choosing a colour for lime-plastered walls

Lime plaster provides a beautiful backdrop for natural paint colours, from soft whites and earthy neutrals to richer greens, blues and reds.

Our palette is created using real earth and mineral pigments, with colours designed to work beautifully together in both historic and contemporary interiors.

Explore our paint samples to see how different shades respond to the light in your home, or speak to our Colour Consultants for help creating a scheme.

For advice on the appropriate paint finish and preparation for your lime plaster, please contact our team before decorating.