Which statement is a direct outcome of performing a coating system holiday test?

• A. Reveals coating defects and breaches
• B. Determines environmental factors
• C. Measures substrate hardness
• D. Assesses coating color

Answer: (A)

Holiday testing uses electrical potential to check a coating system for discontinuities. By applying voltage to the coated surface, current will flow through any gap or defect in the coating to the metal substrate. The direct outcome is locating these defects and breaches—the holidays. This is crucial because these openings can allow corrosive environments to reach the substrate, undermining protection. The test isn’t meant to determine environmental factors, measure substrate hardness, or assess coating color, which are outside its purpose and typically addressed by other tests or inspections.