Limewash consists of sieved lime putty held in suspension in water. It originately was used as a sacrificial coating to lime render. After the lime render had cured, thin coats of natural limewash were applied to build up a protective coat on the render. The weather took its toll and the limewash was reapplied, again in thin coats. The limewash complements the natural properties of flexibility and breathability of the lime render.
Method of application
Natural limewash is supplied in 15 litre tubs. Each tub will cover approximately 42 square metres at one coat. Four to six coats will be required depending on the surface being painted.
- Make sure surfaces are sound.
- Damp down all surfaces.
- Stir tub thoroughly before and during use
- Apply a thin coat using a distemper brush, brushing the wash well into the surface.
- Allow first coat to dry (24 hours).
- Damp down surface and apply second coat. Repeat until substrate is covered completely.
- Limewash can be coloured using natural pigments. See colour card. If using pigment, mix the pigment with a small amount of water before adding to the limewash.
Lime Paints from St Astier
Vibrant and beautiful, the St Astier lime paint range is the perfect compliment to lime plaster, render and harling, suitable for most backgrounds. Can be applied to gypsum plasters, lining paper, cement and lime backgrounds, bricks, blocks and untreated timber.
The general ratio is 1 volume of powder to 2 volumes of clean water. Further dilution might be necessary on porous backgrounds.
The lime paint is supplied in tubs as a powder for mixing on site with water. The tub has a fill line for normal use.
Proper mixing is essential. When mixed it should be completely free of lumps or fine particles. Check the bottom and sides of the mixing tub to ensure all the powder is fully combined.
- Do not work in temperatures below 8°C or above 30°C or in a humid environment.
- Protect painted areas from direct sun, drying wind and rain for 3 to 4 days (longer in damp weather conditions).
- Do not use warm air dryers.
- All new rendered or plastered surfaces should be properly dry before applying lime paints.
- Apply with a good quality long hair brush in short strokes.
- Evenly and thinly spread the lime paint on the surface, work into any small hollows or cracks.
- Do not overload the brush, use only the bottom third of the bristles, do not apply unevenly.
- Stir regularly during application.
- Generally 2 coats are sufficient.
- Wait 12-24 hours between coats.
- On large areas of work, always keep the working edge damp, do not allow the lime paint to dry out and form a dry joint.
- Inadequate protection of the working area will exacerbate drying.
- Maintain a dampened background in advance of application with a light mist spray if necessary.
- Sufficient personnel should be used to complete large areas without forming dry joints.
- Always finish whole walls or elevations into details, angles, corners, down pipes or the like in one operation to avoid colour banding.
- St. Astier Lime Paints can be sprayed: please consult The Traditional Lime Company.
- Remove any loose or flaking paints and repair defective plasters or renders.
- Test the background for suction by lightly flicking clean water from a brush on to the surface of the wall.
- Rapid suction into the background means that dampening with clean water will be required. In this case it may also be necessary to thin the first coat with 30% additional water. If thinning is required mix as normal then take out with a measured container the quantity you require to be thinned, place it in a separate container and add the extra water.
- A low suction background does not require pre wetting or additional thinning for the first coat.
- Very smooth or polished surfaces offering little or no suction might require sanding down with sand paper to create the necessary suction.
- Ensure that background is dry, clean and sound.
- Do not use lime paint in areas subjected to abnormal condensation such as a kitchen or bathrooms, unless sufficient ventilation is available to prevent condensation.
- Lime paints are not film-forming materials that will hide the background condition therefore salts and dampness will show through.
- Some surfaces may have variations in background materials (i.e.: brick, stone, cement, etc) and therefore care is required in controlling differing suction levels.
- Due to the additives content of some modern gypsum premixed plaster there may be some reaction with lime paints. Furthermore gypsum plasters tend to be extremely smooth and therefore would need to be lightly sanded down to provide a suitable surface before applying lime paint.
- Wallpaper joints are often smeared with adhesive during hanging. Make sure that the adhesive paste used is water-soluble. Clean the joint before applying lime paint, as excess adhesive residues on the face of the paper will cause the lime paint to dry out a different colour.
If in doubt, always try on a small test area.
Not to be used on backgrounds with no suction or containing waterproofing agents, oil paints, grease, distempers or cement paints which have water repellent agents.
Do not use below 8° C or above 30° C. Avoid working in foggy/ damp weather.
Earthborn Clay Paints
The Traditional Lime Company provide the complete range of Earthborn Natural Paints.
Earthborns unique clay recipe results in a hardwearing, highly breathable finish, with no horrible smells or emissions. Apply by brush or roller, which are then washed in water. Available in 5 litre or 2.5 litre tins. Coverage approximately 10m2 per litre.
With over 30 vibrant colours to choose from and the assurance of the prestigious Eco-label award, you can be sure of a finish of the highest quality.
Painting Lime Plasters
Made by mixing lime putty with water. Cures to a milky white. Requires two coats, maybe more depending on background.
Sold in 15 litre tubs. Each tub will cover 42m² at one coat.
Coloured lime wash can be created by the customer by adding pigments to the limewash.
ST ASTIER LIME PAINT
Based on hydraulic lime, this paint comes in a range of colours. A litre of paint will cover approximately 9m² at one coat, depending on background. Two or more coats will be required.
EARTHBORN CLAY PAINT
Highly breathable and washable. A range of colours. Coverage 5-8m² at one coat. May need thinned coat first if surface is very porous. Slight texture.
As Claypaint but smooth and with less covering power. Approximately 10% cheaper than Claypaint.