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A building, partially clad in fluoropolymer coated aluminum panels, was observed to have an aesthetically unacceptable appearance while still under construction. Once installed on the building, many of the panels exhibited a vertical streaked appearance under certain conditions. When the panels were at ground level, or when the sun was bright, the streaky appearance was not noticeable. However, in conditions of low light, such as during early morning, dusk, or on cloudy days the streaky appearance was reported to become apparent. A visual mock-up, consisting of multiple coated panels that had been approved by the architect as a guide to the anticipated appearance were also present on-site as a reference. This visual mock-up was used as a reference for acceptable appearance of the coated panels.
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An increase in useful life expectancies for structures requires the stringent process control of applied protective coatings. Evaluating the uniformity of the protective coating thickness is a critical quality component. Solutions for meeting industries’ ultimate goals of reducing costs, lessoning errors, and increasing quality will be discussed in the following coating thickness measurement overview.