ARCHITECTURAL COATINGS ARE THE PAINTS AND COATINGS used to coat buildings and homes. Most are designated for specific uses such as roof coatings, wall paints, or deck finishes. No matter its use, each architectural coating must provide certain decorative, durable, and protective functions. Different test protocols may be applied in the evaluation of an architectural coating depending on its intended end-use. For the purpose of this testing manual, the definition of the term Architectural Coating is most distinctly stated by standards ASTM D5146-10 and D5324-10 . These two standards share the following definition of architectural coatings: “Organic coatings intended for on-site application to interior or exterior surfaces of residential, commercial, institutional, or industrial buildings, in contrast to industrial coatings. They are protective and decorative finishes applied at ambient temperatures.” Although factory-applied coatings for building products such as vinyl siding or aluminum window frames may ultimately be used for architectural end-uses.