PCS Coating Failure Analysis and Remediation 2

Question 1

Which type of coating failure is characterized by fine, shallow cracks that do not penetrate through the entire coating film thickness?

Accepted Answer

Checking

Answer

Crazing

Answer

Splitting

Answer

Delamination

Question 2

Rust staining on a coating surface in the absence of visible coating failure most likely indicates which underlying condition?

Accepted Answer

Mill scale or embedded iron remaining on the substrate

Answer

Cathodic disbondment

Answer

Contamination introduced in the coating material

Answer

Moisture vapor transmission through the film

Question 3

When investigating a coating failure, what must be the first step before any remediation work begins?

Accepted Answer

Document and photograph the failure in detail

Answer

Remove all failed coating immediately

Answer

Apply new coating over the failed area

Answer

Test the dry film thickness of the failed coating

Question 4

Cathodic disbondment of a protective coating is most commonly associated with which system?

Accepted Answer

Cathodic protection systems

Answer

Solvent-based alkyd coatings

Answer

Excessively thick epoxy coatings

Answer

High-temperature silicone coatings

Question 5

When a coating failure extends through the entire coating system down to bare substrate, which remediation approach is required?

Accepted Answer

Complete removal to bare substrate and full recoating

Answer

Spot repair with a compatible topcoat only

Answer

Power tool cleaning and spot prime only

Answer

Overcoating with a penetrating sealer

Question 6

Osmotic blistering beneath a coating is primarily caused by which condition?

Accepted Answer

Water-soluble salts trapped beneath the coating film

Answer

Excessive dry film thickness applied in one coat

Answer

UV exposure degrading the coating binder

Answer

Application at ambient temperatures above 90°F

Question 7

Which test is most appropriate for determining whether an existing coating is compatible with a proposed overcoat system?

Accepted Answer

Solvent rub test

Answer

Cross-cut adhesion test

Answer

Holiday detection test

Answer

Wet film thickness measurement