NASCLA Accredited Commercial General ContractorFinishesMedium
A commercial painting contractor is preparing to paint interior walls in a newly constructed office building. The walls are finished with a standard gypsum board and a Level 4 finish. The client desires a high-sheen, dark-colored paint. What additional preparation step is MOST critical before applying the finish coats to achieve a uniform, blemish-free appearance?
- AWashing the walls with a bleach solution
- BApplying a dedicated skim coat or Level 5 finish
- CSanding the entire surface with 220-grit sandpaper
- DApplying a high-build texture coating
Show answer & explanationAnswer & explanation
Correct answer: B. Applying a dedicated skim coat or Level 5 finish
A Level 4 finish, while common, may not completely hide minor imperfections when a high-sheen, dark-colored paint is applied, which tends to highlight flaws. A Level 5 finish (a thin skim coat) is essential to achieve a uniform, blemish-free appearance under such demanding paint specifications.
Why the other options are wrong
- A. Washing with bleach is for mold or mildew, not for achieving a smooth, uniform surface for high-sheen paint.
- C. While sanding is important, it won't correct the underlying lack of uniformity inherent in a Level 4 finish when paired with high-sheen paint.
- D. A high-build texture coating would change the surface appearance, which is not implied by 'blemish-free' with high-sheen paint.
Level 5 Drywall Finish
The highest level of gypsum board finish, consisting of a skim coat of joint compound applied over the entire surface, providing a uniform surface suitable for critical lighting conditions and high-sheen paints.
- Required for dark colors, high-sheen paints, and critical lighting.
- Minimizes surface imperfections and texture differences.
- Achieved by applying a thin, continuous coat of joint compound.
Memory trick: High sheen, dark paint, Level 5 is your finish fate.