Keim is a mineral based paint, and absolutely fantastic for masonry surfaces, interior and exterior. It has the Same soft bounce of light as traditional lime washes and is an extremely durable finish. The high performance is primarily due to the paints ability to bond into the substrate instead of on it, this means that the mineral paint becomes a part of the substrate. This paint is our choice for historical renovations, for a lifetime finish over traditional stucco, and for high traffic areas and very exposed surfaces that need extra protection from the elements.