Paint Defects – Practical Remedies on Site Which of the following sets correctly states workable remedies for common paint defects such as blistering, cracking, and crawling on building surfaces?
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AFor blistering, apply water paint and finish with oil paint dried with a little copal varnish
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BFor cracked paint, remove unsound film completely and apply a fresh, compatible coat
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CFor crawling, key the surface by sanding/cleaning and recoat with adequate turpentine thinning
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DAll of the above
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ENone of the above
Answer
Correct Answer: All of the above
Explanation
Introduction:Paint failures on site often manifest as blistering, cracking, and crawling (poor wetting leading to bare patches). Knowing practical remedies helps restore durability and appearance, aligning with manufacturers’ guidance and standard site practice.
Given Data / Assumptions:
- Substrates are typical plaster or primed wood/metal.
- Failures are not caused by structural dampness that would require separate remediation.
- Compatible systems and proper surface preparation are available.
Concept / Approach:
Defect remediation combines removal of unsound film, correction of surface energy/cleanliness, and careful recoating with compatible materials and correct solvent ratios. Historic guidance includes limited use of copal/varnish additives for film improvement where appropriate.
Step-by-Step Solution:
1) Blistering: break/remedy blisters, allow substrate to dry; traditional touch-ups may use water paint undercoats finished with oil paint aided by a small copal addition to harden the film.2) Cracking: scraping/burning-off to a sound edge and recoating is essential; merely overcoating traps defects.3) Crawling: clean/sand to raise surface energy and recoat at proper viscosity; turpentine adjustments improve flow/wetting for oil-based systems.4) Verify adhesion and finish by proper drying intervals and compatibility checks.Verification / Alternative check:
Manufacturer technical data sheets and classic painting guides emphasize removal of defective films, surface preparation, and correct thinning/priming sequences to cure these defects.
Why Other Options Are Wrong:
Each individual remedy listed addresses a known mechanism; “none” is invalid since workable remedies are provided; hence “all of the above” is correct.
Common Pitfalls:
Painting over damp substrates, skipping surface cleaning, or using incompatible thinners/primers that reproduce the same failures.
Final Answer:
All of the above