Exterior flat house paint must provide a uniform finish without variations in thickness or gloss, even when the paint is applied to a large exterior surface such as a condominium wall. Differing from the interior paint used in factories where temperature and other environmental factors are kept constant, house paint is used under widely varying conditions, and is applied by painters with widely differing skills. In this study, an experiment was carried out to find the construction environmental factors that cause uneven gloss, and a flat paint was developed that is resistant to the effects of these factors and produces an even finish. This product was developed by defining uneven gloss in terms of the amounts of reflected light entering the eye at various angles and carrying out a standard signal-to-noise ratio analysis. This led to the development of a flat paint in just a few months, as compared with at least a year for flat paints developed by conventional methods.
