Test Questions and Answers | Latest
Version | 2025/2026 | Correct & Verified
What is the primary purpose of surface preparation in coating application?
✔✔To remove contaminants and create a profile that promotes coating adhesion.
Which type of corrosion occurs uniformly across a metal surface?
✔✔Uniform corrosion.
Why is abrasive blasting preferred for cleaning steel surfaces?
✔✔It removes rust, mill scale, and old coatings efficiently while creating a proper surface
profile.
What is the main function of a primer coating?
✔✔To provide corrosion protection and promote adhesion of subsequent coats.
Which tool is used to measure dry film thickness?
✔✔Magnetic or electronic thickness gauge.
Why is it important to check the dew point before coating?
✔✔To prevent condensation, which can cause adhesion failure and coating defects.
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, Which surface contaminant is most likely to cause coating failure?
✔✔Oil or grease residues.
What is the purpose of an intermediate coat?
✔✔To build film thickness, enhance corrosion resistance, and provide a uniform surface for the
topcoat.
Why must coatings be applied within the overcoating interval?
✔✔To ensure proper adhesion between layers and prevent delamination.
Which coating defect appears as small holes exposing the substrate?
✔✔Pinholing.
Why is surface profile important for coating performance?
✔✔It provides mechanical anchoring, improving adhesion and longevity.
Which environmental factor most accelerates steel corrosion?
✔✔Moisture and oxygen exposure.
What is the main cause of blistering in coatings?
✔✔Trapped moisture or solvent under the coating.
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