Id like to use a limewash on my house, but its already got a coat of paint on it. Will limewash adhere to a painted surface?
Limewash should only be applied to porous, water-permeable surfaces, so it will not perform well if it’s applied over an existing coat of latex or oil-based paint or sealer. Limewash is ideal for unpainted stucco and plaster, and it is also suitable for porous brick and stone. Because it requires a porous substrate, it generally does not work well over granite or marble. Unfortunately, many historic masonry walls have been painted over the years, and impermeable paints and coatings cause major problems for old stone and brick. It is usually advisable to remove these coatings, regardless of whether or not you plan to apply a limewash or other lime-based parging. A word of caution is in order, however-it is very important to hire only well-qualified masonry cleaning contractors. Inappropriate cleaning chemicals and techniques can cause irreversible damage to historic masonry. For more information, read the National Park Service Preservation Brief 1 “Assessing Cleaning and Water-Repellent
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