Harling's a Scottish term describing an exterior building surfacing technique. The theory of harling's to produce a long-lasting weatherproof shield for a stone building. The pigment's embedded in the harled material, thus obviating the need for repainting. Harling's a technique used to surface many of the Scottish castles, but it's also used for a variety of common building types. It's long-lasting and practical and well suited to the Scottish weather. Harling's a process of covering stonework,… (More on Harl)