Difficulty: Easy
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:
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
Discussion & Comments