Steps

Confirm the governing standard is NACE SP0188 (current 2024 edition), 'Discontinuity (Holiday) Testing of New Protective Coatings on Conductive Substrates,' still carrying its legacy NACE SP prefix under the AMPP standards catalog (content.ampp.org) — it was not renamed to an 'AMPP' prefix after the 2021 merger
Determine whether low-voltage (wet sponge, for coatings roughly under 500 µm/20 mils) or high-voltage (spark) testing applies based on the coating's dry film thickness
For high-voltage spark testing, do not rely on the old informal 'rule of thumb' of ~100 V per mil without checking the current SP0188-2024 guidance, since AMPP flagged that the historical voltage-setting convention lacks a traceable scientific basis and the standard's approach to voltage selection has been revised
Calibrate/verify test equipment per manufacturer instructions and confirm the substrate is properly grounded before testing
Mark, log, and repair any holidays found, then retest the repaired area before final acceptance

Known gotchas

Applying high-voltage spark testing to a thin coating (or low-voltage wet-sponge testing to a thick coating) can damage sound coating or fail to detect real discontinuities — thickness-appropriate method selection is not optional
For fusion-bonded epoxy (FBE) pipeline coatings specifically, a separate, more specialized standard (NACE SP0490) governs holiday detection technique — do not default to generic SP0188 procedure for FBE pipe coatings

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Perform holiday (discontinuity/pinhole) testing on a new protective coating over a conductive substrate

Steps

Known gotchas

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