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It is important to ensure there are no defects or discontinuities present that expose the substrate beneath after a protective coating has been applied. Small patches of weak or missing coating, known as 'pinholes' or 'holidays,' can act as corrosion foci, reducing the life of a protective coating system dramatically. A non-destructive equipment for detecting discontinuities in a coating system, such as holidays, pinholes, and cracks, is a pinhole or holiday detector. Porosity detector, continuity tester, holiday tester, spark tester, and jeep metre are some of the other names for this device.
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