A coating is applied to a substrate to prevent corrosion, reduce abrasion, and reduce product contamination. The degree of coating continuity required is dictated by service conditions. Discontinuities in a coating are frequently very minute and not readily visible. This standard practice provides a procedure for electrical detection of minute discontinuities in new coating systems that are applied to conductive substrates. The user should refer to NACE Standards RP0274, RP0490, and/or TM03843 for procedures specific to electrical inspection of pipeline coatings. This standard describes procedures for determining discontinuities using two types of test equipment: low-voltage wet sponge testers and high-voltage spark testers.