Limewash may be used inside or outside as long as it is applied to a surface that can draw the limewash into it. Limewash relies on being drawn in to a substrate unlike a modern paint that adheres to the surface. The process of being drawn in needs to be controlled by damping down, the a wall is not damped it can leave the lime and pigments on the surface and powdery, if the wall is saturated then there is no surface tension and this can result in failure of the limewash. Damping down is not difficult but it does need to be considered before application of the limewash
Below is a close up of lime putty mortar pargetting that has had one coat of 'Red Earth' limewash on the left, the sword has had one coat of white limewash with the area on the right being the natural floated finish. For outside areas, we would recommend 4 x coats of coloured limewash or 5 x coats of white limewash onto new render.
Below shows the way limewash dries out. It looks very patchy due to differences in the suction in the background caused by dampness. Do not be alarmed if you are applying limewash for the first time, this is normal. However, be aware that limewash may always be patchy and when used outside will be subject to rain and therefore will become more patchy at times. Very pale or white limewash is less obvious than more intense colours.
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