What is lime wash paint?
Lime wash paint, also written as limewash paint or lime wash, is a traditional finish based on lime. Traditional limewash is commonly produced from slaked lime mixed with clean water and pigments. It is brushed on in a thin coat so it can penetrate and bond with a suitable mineral surface rather than behaving like normal paint that simply forms a film.
During curing, lime reacts with carbon dioxide and converts back towards calcium carbonate. This gives limewash its matt, chalky finish and a breathable surface with natural colour, texture and depth.
Why choose limewash for traditional walls?
Limewash is an excellent choice for many older buildings because it allows moisture to move through the wall instead of trapping it behind an impermeable paint layer. This is particularly important on lime render, lime plaster, soft brick and stone where traditional construction relies on a wetting and drying cycle.
Unlike paint systems that create a thicker sealed film, traditional limewash remains highly breathable. Its natural properties can help walls manage moisture while creating a traditional finish that suits heritage interiors and outside masonry.
The alkaline nature of limewash can also make the surface less hospitable to mould and biological growth. Promain still recommends dealing with persistent damp or mould before you decorate. Clean grease marks and stains first rather than expecting paint to hide a building defect.
Limewash paint for interior walls
Promain stocks The Traditional Paint Company Interior Limewash for interior walls and ceilings. It is designed for surfaces including lime render, lime plaster, concrete, emulsion, lining paper and traditional plaster backgrounds, making it useful where you want a breathable decorative limewash appearance inside a building.
This limewash creates a soft matt and slightly transparent finish rather than the uniform look of standard emulsion. The brush marks, variation in porosity and natural movement of the material create the tonal texture associated with coloured limewash.
For a more controlled contemporary effect, Promain also offers KEIM Colourwash. This is not traditional limewash, but a ready-mixed mineral system for bare and previously painted walls and ceilings. It creates a limewash aesthetic with a one coat decorative application over the specified base, helping produce a more controlled perfect finish without the same dilution process.
Limewash paint for exterior walls
Exterior lime wash paint is best suited to compatible porous masonry and traditional backgrounds. Promain supplies limewash systems for lime render, brick, stone and mixed external masonry where a breathable coating is required.
The Traditional Paint Company Pozzolan Limewash is available from Promain for difficult or mixed surfaces including flint, stone, brick and cement render. Its formulation is designed to improve adhesion while retaining the appearance and breathability expected from a limewash finish.
On outside walls, frost, rain, direct sunlight and drying weather affects limewash work. Promain recommends planning the job around appropriate weather and following the manufacturer's application advice so each coat can cure correctly before subsequent coats are applied.
Which Promain Paints limewash product should you choose?
For traditional lime render, lime plaster and previously limewashed surfaces, a conventional limewash system is usually the first option to consider. For mixed materials or surfaces that are more difficult to coat, Promain may recommend Pozzolan Limewash because it is formulated for improved adhesion across varied backgrounds.
For walls where the main aim is a decorative limewash effect, KEIM Colourwash gives Promain customers a ready-to-use mineral option. It is used with KEIM Colourwash BASE and can be paired with KEIM Colourwash Lime Primer on bare lime plaster where required by the system.
Can limewash be applied over existing paint?
Traditional limewash performs best when it can penetrate porous, unsealed mineral materials. On many sealed surfaces, other paints can prevent the limewash from bonding correctly. That is why generic advice often says limewash should not be applied directly over existing paint.
Promain's range includes exceptions. The Traditional Paint Company Interior Limewash is formulated to adhere to some previously emulsioned areas, while Pozzolan Limewash is designed for difficult and mixed substrates including some already painted surfaces. KEIM Colourwash is also intended for bare and previously painted surfaces when the specified base system is used.
How to prepare walls for limewash
Proper preparation controls both adhesion and the final colour. Remove dust, dirt, loose particles and failing coatings. Repair cracks or holes with materials compatible with the original wall and make sure fresh lime render or lime plaster has had enough time to cure.
Porosity matters because limewash needs controlled suction. On a very dry porous surface, lightly mist the wall with clean water before applying limewash. The surface should be evenly damp rather than running wet. This helps the first coat spread and penetrate without drying too quickly.
If mould is present, use an appropriate treatment and allow the surface to dry as directed. Protect adjacent materials, floors and clothing because lime products can stain and traditional limewash can be caustic. Promain's technical team can provide advice when the background is uncertain.
How to apply limewash paint
Applying limewash is different from rolling on normal paint. Use the brush recommended for the product, normally a specialist limewash or good masonry brush, and work the material into the surface. A roller can lay on too much material and may increase the risk of cracking or an uneven finish.
Start with the first coat at the dilution stated by the manufacturer. Promain's Traditional Paint Company application guide recommends a three-coat system for many new-render applications. The first coat of limewash is more heavily diluted than subsequent coats, and one coat of limewash is not normally enough for full traditional limewash work on a fresh background.
Use a suitable brush and apply coats of limewash as thin coats. Keep a wet edge and avoid direct sunlight, strong drying wind, heavy rain or frost. Allow the first coat to cure before applying limewash again. Subsequent coats build colour, coverage and protection. Extra coats should stay thin, and the final coat of limewash should remain even.
Depending on the project, three coats may be recommended, while four coats or several coats can be used where the desired finish calls for additional coats. Keep coats thin, allow coats to cure and avoid adding unnecessary coats. Promain advises following the exact limewash application method, dilution and overcoating times for the chosen system. Correct limewash application gives the coats time to cure and helps create a durable finish.
How does coloured limewash change as it dries?
Coloured limewash normally looks much darker when wet. As the limewash cures and carbonates, the colour becomes lighter and softer. Surface texture, absorbency, exposure and the number of coats all influence the final appearance.
Natural pigments and mineral pigments can create subtle colour variation rather than a flat block. This gives limewash much of its character, but it also means sample areas are useful before you decorate a complete wall and compare colour depth across the surface.
Promain offers a broad range of colour options across its traditional and mineral systems. Colour choice can include pale neutrals, warmer heritage tones and deeper shades, with black lime wash paint possible where the selected product can be tinted appropriately. Ask Promain for colour advice before purchase because wet colour, screen colour and final dry colour can differ.
What are the main benefits of limewash?
Limewash offers a breathable, matt finish that works with many traditional materials. It can protect and decorate compatible masonry while allowing moisture vapour to pass through. On the right surface, the coating becomes part of the wall rather than sitting on it like many other paints, creating a durable finish with natural colour movement.
It is also valued for its texture and depth. Brush passes and extra coats add movement. This makes limewash suitable for period restoration and heritage buildings where you want to decorate without losing the natural character of the surface.
Traditional limewash is based on natural materials and can have very low VOC content, though exact composition varies by product. Promain recommends checking the current technical and safety information for the specific limewash paint you are considering.
What are the disadvantages of limewash?
Limewash needs careful preparation, several coats and controlled drying. Colour can vary with porosity and the finish may remain chalkier than conventional masonry paint.
It also needs maintenance. Weathering gradually changes limewash outdoors, and an older surface may need a fresh wash or additional diluted coats. This ageing is part of the traditional nature of the finish, but it may not suit a project that requires a very uniform, wipe-clean coating.
Traditional limewash can also be caustic during application. Wear the protective clothing and equipment stated in the safety data. Promain can help you compare limewash with mineral masonry paint or another breathable system where the project needs different durability or maintenance characteristics.
Is limewash the same as watered down paint?
No. Limewash is not simply ordinary paint mixed with water. Traditional limewash uses lime as its key mineral component and cures through carbonation. Water is used to adjust application consistency, but the material behaves differently from conventional emulsion or masonry paint.
Other paints can create a washed look, but they do not share limewash composition or vapour behaviour. For the appearance alone, Promain's KEIM Colourwash provides a purpose-made alternative to an improvised wash.
Can you make your own lime wash?
Traditional recipes mix slaked lime or lime putty with clean water and suitable pigments, but working with lime requires care because the material is alkaline and can cause injury. The mix also affects adhesion, colour and durability.
Promain recommends manufactured limewash with published application and safety information. This gives clearer advice on coverage, colour, dilution, drying and coats while reducing uncertainty around stains and other elements of the finish.
Buy lime wash paint from Promain Paints
Promain supplies lime wash paint and limewash paint for interior and exterior walls across the UK. The range covers traditional limewash, coloured limewash, specialist products for lime render, lime plaster, brick and stone and mineral systems for a contemporary limewash effect.
Browse the Promain range above, select the colour and size you need and add the chosen product to your basket. If you are unsure which product suits the surface, contact Promain for technical advice on your walls before ordering. Promain can help you compare the substrate, porosity, existing finish, weather conditions and desired finish so you choose a suitable system rather than relying on guesswork.