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Multiple Choice Questions on Coating Failures |
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| Questions 6 - 10 |
Page 2 of 2 |
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6. |
Cracking occurs as the coating ages, as it is subjected to expansion and contracting. It is a serious defect, however, it can be minimized by |
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using a reinforcing pigment |
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using cathodically protective pigments |
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using a proper additive |
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using an appropriate extender |
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7. |
Runs and sags belong to a well-known class of failure known as |
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formulation-related failures |
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design-related failures |
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application-related failures |
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| [ ] | None of the above | |
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8. |
Which one of the following factor would cause blistering? |
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Fast evaporating solvent |
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Insoluble pigment |
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Slow curing |
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| [ ] | Improper shop primer | |
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9. |
To which category the pinhole defect belongs? |
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Formulation-related |
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Application-related |
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Design-related |
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| [ ] | Adhesion-related | |
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10. |
If a coating fails by blistering and occurs all over the surface, the best remedy is to |
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remove the entire coating and apply a new coat |
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select a proper vehicle/pigment ratio |
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apply a new coat and re-prepare the surface before application |
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apply a new coat only at the damaged areas |
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