Published: Jan 1972
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The final test of a paint is its performance under actual conditions of use. For exterior paints, this means on the walls of buildings, railway cars, highway vehicles, ships, and the like. Such tests are expensive and time consuming. Hence, there has developed the practice of conducting tests on a small scale. These screening tests allow studies of the effects of many variables to be made in a fraction of the time and at a fraction of the cost of full scale tests. For final judgment, full scale tests must usually be made.