Traditionally limewash was the principal protective and decorative finish used both for interior and exterior surfaces. This is important to note, that limewash - and all paint products for that matter - have the primary purpose to protect whatever is is applied to.

Although often thought of as a decorative coating, the limewash was first of all a protective layer to the lime coatings and masonry substrate. On new lime renders and plasters it unifies and protects the surface particularly while strength is developing within the new plaster. Infact, lime wash is not a paint. When coated, the building is actually protected by a layer of calcium hydroxide, which overtime reverts to calcium carbonate. In other words, it become a thin layer of 'limestone', that is not affected by UV rays.

As with all lime products in general, limewash is a natural product providing a breathable coating. This allows the evaporation of moisture and water vapour.

Limewash is a very useful for repairing surfaces. The fine material serves to fill small shrinkage cracks on lime materials, plasters, renders and existing limewashes. Highly versatile, limewash may be painted onto most porous surfaces, such as stone, brick, mortar, harling, plaster, render, earth and timber. 

limewash provides a 'sacrificial' protective coating. That is to say the elements take their toll on the limewash, which in turn protects the underlying lime based render, harling or mortar.

Due to it's watery quality, limewash may be mixed with fine aggregates to make a shelter coat, especially useful for protecting friable surfaces.

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