!! How to apply Limewash

https://www.limestuff.co.uk/blog/how-to-apply-limewash

Using Limewash Internally

Limewash is ideal for internal use as it is unaffected by rising damp which continually breaks down most other paints. However, it is best not to use additives such as casein, tallow or linseed oil as this will reduce absorption and hinder the evaporation of moisture within the wall.

Coloured Limewash

Generally earth PIGMENTS were used to colour the limewashes, most commonly ochre’s, but also siennas and umbers, which produced a range of yellows, reds and oranges. Broadly speaking these produced pastel shades, although deeper colours are not uncommon. Coal dust, ash, blood and ground stone dust have all been found as additives in historic limewashes to achieve the desired colour.

How do you apply limewash?

Application of Limewash - Preparation
Surfaces to be limewashed must be clean, free from grease and they must be porous. Previously limewashed surfaces must be well brushed down and any loose limewash scrapped off. Any mould should be treated with fungicide and thoroughly washed off with clean water. Do not use fungicides, which contain silicon.

Damping Down

Limewash should never be applied to a dry surface, as this will cause rapid drying out of the limewash and result in dusting. SPRAY about 3 sq/m of the surface to be limewashed with water until the surface is damp but not running with water. Do not try to damp down the whole wall or ceiling at one time, as most of the area will be dry before it can be limewashed. Dry joints must be avoided as these will result in the limewash gaining a patchwork appearance.

Application

Limewash is best applied by using a flat brush or masonry paintbrush. Stir the limewash well before and during application, apply working the wash well into the surface. The limewash should be applied in several thin coats. Avoid runs or drips running down the face of the work.

How many coats of limewash do I need?

The limewash will appear transparent when first applied so care must be taken not to build up the limewash too quickly as this will craze on drying. Each coat should be allowed to dry before the next coat is applied. We recommend 24 hours between coats. It is very important to rewet the previous coat before applying the next coat. At least 4 coats will be needed to cover new work. Each coat will need to be burnished into the surface with a dry brush as it starts to ‘gel’. This will give a surface free from brush strokes and leave a unified finish.

As earth pigments are a natural product slight variations in colour do occur. We highly recommend when ordering coloured limewash order the whole amount required plus 15%, this should then be mixed together in a large container and will avoid variation in colour over the job.

Common Mistakes when applying limewash and Solutions ..