11Appearance
One of the two main objectives of applying a coating is providing protection of the substrate against outside influences. Hence, homogeneity of quality and thickness of a coating are important to realize proper protective action. Defects, as referred to at several locations in the preceding chapters, can compromise this function. Here we summarize the main occurring defects and their causes. Defects also influence the other main reason to use coatings, namely, aesthetics, but evidently the color of a coating plays a major role in this as well. Individuals judge color rather subjectively, and thus there is a (strong) need for a quantitative assessment. The characterization of color is rather different from the usual chemical and ...
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