A holiday spark test is a procedure used to check for inconsistencies such as pinholes, discontinuities, holidays and voids in coatings covering metallic surfaces.
In a spark test, a voltage is applied across metal fibers temporarily placed on the coated surface. Where holidays exist, the underlying metal surface is accessible and a circuit is created that allows an electric current to flow. This creates a spark and notifies a device or person of the holiday. Holiday spark tests are particularly important when applying anti-corrosive coatings, because undetected holidays leave the underlying metal prone to corrosion at those locations.
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