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NACE COATING INSPECTOR PROGRAM
— LEVEL 2 PRACTICE EXAMINATION
QUESTIONS AND CORRECT ANSWERS
(VERIFIED ANSWERS) PLUS RATIONALES
2026 Q&A | INSTANT DOWNLOAD PDF
Which of the following is the most common cause of coating failure due to improper surface preparation? a) Contaminated solvent b) Inadequate removal of mill scale c) Excessive film thickness d) Ambient temperature within limits Rationale: Mill scale prevents proper adhesion; inadequate removal leads to coating failure. 2) Which abrasive blast profile is typically required for high-performance coatings? a) 25–35 μm b) 50–75 μm c) 75–100 μm d) 5–15 μm Rationale: High-performance coatings often require a deeper blast profile (75– 100 μm) for mechanical anchoring.
What instrument is used to measure surface profile? a) Thermometer b) Hygrometer c) Surface comparator or replica tape d) Gloss meter Rationale: Surface comparators and replica tape are standard for profile measurement. 4) Rust grade for SSPC-SP 10 is most similar to: a) White metal b) Very thorough blast cleaning c) Commercial blast cleaning d) Brush blast cleaning Rationale: SP 10 describes very thorough removal of rust and mill scale. 5) In coating terminology, “flash rust” refers to: a) Complete rust removal b) Rapid rusting after blasting before coating c) A defect caused by solvent entrapment d) A high gloss finish Rationale: Flash rust forms when blasted steel re-oxidizes before coating application.
Which test identifies soluble salts on a surface? a) Pull-off adhesion b) Bresle test c) Holiday detection d) Pencil hardness Rationale: The Bresle test quantifies chloride and other soluble salts. 10) Holiday testing is primarily used for: a) Measuring gloss b) Testing solvent resistance c) Detecting pinholes or defects in coatings d) Determining flash point Rationale: Holiday testing detects discontinuities in coatings. 11) What is meant by “cure”? a) Only physical drying b) Chemical cross-linking and drying of the coating c) Abrasive blasting d) Measuring film thickness Rationale: Cure involves chemical reactions that develop coating properties. 12) Which SSPC specification covers shop primer paint? a) SP 6 b) PA 2
c) None; shop primers are specified by coating manufacturer requirements d) SP 10 Rationale: Shop primer selection is per project, not an SSPC surface prep standard. 13) Infrared thermometers are used to measure: a) Surface profile b) Soluble salts c) Surface temperature d) Dry film thickness Rationale: IR thermometers give rapid surface temperature readings. 14) What does “flash point” indicate? a) Drying time b) Temperature at which vapors ignite c) Sand-through resistance d) Soluble salt content Rationale: Flash point is safety-related for flammable liquids. 15) Which factor increases the risk of blistering? a) Thin coating b) Moisture or contamination at the substrate c) Correct profile d) Adequate ventilation
Which abrasive gives sharpest profile? a) Coal slag b) Garnet c) Plastic media d) Corn cob Rationale: Garnet creates a pronounced profile due to hardness and shape. 20) Surface cleanliness level SSPC-SP 5 refers to: a) Commercial blast b) White metal blast c) Power tool cleaning d) Solvent wipe only Rationale: SP 5 is the highest standard (white metal). 21) Which of the following coatings is most sensitive to moisture during cure? a) Epoxy polyamide b) Zinc-rich primers c) Polyurethane d) Acrylic latex Rationale: Zinc-rich primers can blister or lose adhesion if applied on wet surfaces. 22) The term “overcoating window” refers to: a) Maximum storage life of coating b) Maximum exposure to sunlight
c) Time range for applying the next coat d) Film thickness measurement period Rationale: Overcoating window defines minimum and maximum intervals for recoating. 23) Which test measures adhesion of a coating? a) Bresle test b) Holiday detection c) Pull-off adhesion test d) Wet film thickness Rationale: Pull-off adhesion directly measures the coating’s bond strength to the substrate. 24) High humidity during curing can lead to: a) Higher gloss b) Blistering and reduced adhesion c) Faster cure d) Increased dry film thickness Rationale: Excess moisture can interfere with chemical reactions and promote defects. 25) Which standard governs SSPC-SP 6? a) Hand tool cleaning b) Commercial blast cleaning
Curing of moisture-cured urethanes is affected by: a) Surface profile only b) Dry film thickness only c) Humidity d) Solvent type Rationale: Moisture-cured coatings rely on ambient humidity for proper chemical reaction. 30) Which method is used for detecting holidays in non-conductive coatings over steel? a) Bresle test b) High-voltage spark tester (holiday detector) c) Wet film gauge d) Profilometer Rationale: Holiday detectors apply high voltage to identify pinholes. 31) What does “blistering” indicate? a) Complete adhesion b) Moisture or gas trapped under the coating c) Correct DFT d) Surface cleanliness Rationale: Blisters form when adhesion is poor or gas is trapped under the film.
When performing abrasive blasting, which factor is most critical? a) Paint type b) Coating cure time c) Pressure, media type, and distance d) Ambient temperature Rationale: Proper blasting depends on correct media, pressure, and nozzle distance. 33) The term “solvent pop” refers to: a) Excessive gloss b) Inadequate profile c) Small blisters caused by trapped solvents d) Rapid curing Rationale: Solvent pop occurs when solvents vaporize under the coating. 34) Which of the following is a standard for measuring surface profile? a) SSPC-SP 10 b) SSPC-SP 6 c) ASTM D d) ASTM D Rationale: ASTM D4417 describes methods for surface profile measurement. 35)
c) Power tool cleaning to bare metal d) White metal blast Rationale: SP 11 covers hand and power tool cleaning to near bare metal. 39) The purpose of a gloss meter is to: a) Detect holidays b) Measure surface reflectivity c) Measure film thickness d) Detect soluble salts Rationale: Gloss meters quantify the shine or reflectivity of the coating. 40) Which factor can cause “cratering” in coatings? a) Proper surface prep b) Contaminated or oily surface c) Correct ambient temperature d) Adequate film thickness Rationale: Oil, grease, or contamination creates craters in the coating surface. 41) Which inspection method is best for detecting microscopic surface defects? a) Wet film gauge b) Holiday detector c) Microscopic surface examination d) Bresle test
Rationale: Microscopic examination reveals small defects not visible to the naked eye. 42) Which type of coating requires induction or mechanical mixing before application? a) Zinc-rich primer b) Two-component epoxy c) Acrylic latex d) Solvent-based enamel Rationale: Two-component epoxies require mixing resin and hardener for curing. 43) What does “film build” refer to? a) Surface roughness b) Gloss measurement c) Thickness of coating applied d) Surface cleanliness Rationale: Film build refers to the thickness of the dry or wet coating. 44) Which coating property is measured using a T-bar applicator? a) Surface profile b) Wet film thickness c) Adhesion d) Gloss Rationale: T-bar applicators create consistent wet film thickness for lab tests.
When performing high-voltage holiday testing, what must the inspector ensure? a) Film thickness is maximum b) Substrate is wet c) Coating is dry and holiday detector is properly calibrated d) Surface profile is minimum Rationale: Holiday detection requires a dry coating and calibrated equipment for accurate results. 49) Which defect occurs when coating dries too slowly due to high film thickness? a) Blistering b) Cratering c) Sagging and runs d) Low gloss Rationale: Thick coatings dry slowly, causing sagging. 50) Which of the following is the primary cause of pinholes? a) High temperature b) Outgassing from substrate or trapped air c) Correct profile d) Low humidity Rationale: Trapped air or moisture escapes during drying, creating pinholes. 51) Which coating characteristic is most influenced by substrate temperature? a) Color b) Gloss
c) Cure rate and adhesion d) Solvent evaporation Rationale: Substrate temperature affects chemical reactions and adhesion. 52) What is the main purpose of a solvent wipe test? a) Measure profile b) Measure DFT c) Detect surface contamination d) Determine cure Rationale: Solvent wipe removes loose particles to verify surface cleanliness. 53) Which environmental factor can cause “wrinkling” of a coating? a) Low humidity b) High temperature or film applied too thick c) Proper surface preparation d) Correct induction mixing Rationale: Rapid solvent evaporation from thick films causes wrinkling. 54) A dry film thickness (DFT) of a coating is measured as 150 μm. The specified range is 100–120 μm. What does this indicate? a) Correct application b) Slight under-application c) Over-application d) Surface contamination
Which coating defect is caused by solvent evaporation trapped under the film? a) Wrinkling b) Pinholes or solvent pops c) Low DFT d) Surface gloss variations Rationale: Entrapped solvents vaporize, forming pinholes or solvent pops. 59) The main advantage of zinc-rich primers is: a) Decorative finish b) Cathodic protection for steel c) Flexibility d) Fast cure Rationale: Zinc-rich coatings protect steel by sacrificial corrosion. 60) Which defect is caused by rapid drying of topcoat over slow-cured primer? a) Blistering b) Wrinkling c) Pinholes d) Low adhesion Rationale: Differential drying rates between layers cause wrinkling. 61)
Which standard describes “white metal blast cleaning”? a) SSPC-SP 6 b) SSPC-SP 5 c) SSPC-SP 10 d) SSPC-SP 11 Rationale: SP 5 defines complete removal of all mill scale, rust, and coatings. 62) Which inspection tool measures gloss? a) Wet film gauge b) Holiday detector c) Gloss meter d) Surface profile comparator Rationale: Gloss meters provide quantitative surface reflectivity measurement. 63) A defect caused by excessive moisture on substrate is: a) Pinholes b) Blistering c) Wrinkling d) Low gloss Rationale: Moisture trapped under coating forms blisters. 64) What does SSPC-SP 10 specify? a) Hand tool cleaning b) White metal cleaning
