Design in building frequently is emphasized by the addition of color in the materials of construction. To keep a designer's color emphasis intact, the influence of dirt accumulation, water absorption, and attack by atmospheric pollutants must be overcome. All of them can be aggravated by deficiencies in design details, construction and maintenance. New buildings that might easily come to look old before their time can benefit from lasting protection with a good paint. Durability, protection, beauty, and economy for exterior and interior surfaces can be had with the use of paints, varnishes and enamels based in polyurethane. Available in clear form or an unlimited spectrum of color, polyurethane coatings can outwear most others used to protect floors, walls, ceilings, and roofs. The coatings are applied conventionally- with brush, roller, or spray. Such considerations have led to the use of solvent-based polyurethanes for the preservation and decoration of exteriors. Only a few practical examples of the many uses or polyurethane paints and coatings for buildings are cited within the scope of this article. Often the easiest, most economical way to correct spotted, blemished and discolored exterior surfaces is to apply a coating. Coatings are also effective in protecting surfaces susceptible to fungus growths, which rapidly cover concrete surfaces with a black deposit in humid, hot climates and make buildings unattractive and difficult to clean after a relatively short time. In the tropics more and more high-rise office buildings are being coated with a light-stable polyurethane varnish to ensure a smooth, dirt-repellent surface. Fungus spores and dust deposits are easily washed off such a surface by rain. A building does not lose its original appearance but retains a bright clean finish. In recent years large cities have been faced with the costly problem of removing graffiti from buildings. Sandblasting or scrubbing are commonly used. Cleanup is considerably simplified if the building was coated initially with a clear or colored polyurethane coating fills pores in the concrete and provides an impervious surface that resists chemical attack. Cleanup can be accomplished by merely wiping down the defaced surface with a solvent. In almost all cases no trace of graffiti will remain on the coated surface.