CSLB C-33 Painting & DecoratingCoating ApplicationEasy
A painter is applying a water-based interior paint to a drywall surface using a roller. To achieve a smooth, uniform finish with minimal roller marks, the painter should generally apply the paint using which of the following techniques?
- AUse a horizontal rolling motion for the entire wall to minimize drips.
- BApply heavy, overlapping coats, ensuring full coverage in each pass.
- CWork in small sections, applying paint in a 'W' or 'M' pattern, then filling in and laying off.
- DRoll only in vertical strokes from top to bottom, without overlapping.
Show answer & explanationAnswer & explanation
Correct answer: C. Work in small sections, applying paint in a 'W' or 'M' pattern, then filling in and laying off.
The 'W' or 'M' pattern followed by filling in and 'laying off' (light, final, uniform strokes in one direction) is a standard and effective technique for roller application. This method ensures even distribution, minimizes roller marks, and helps maintain a wet edge.
Why the other options are wrong
- A. Horizontal rolling is generally less efficient and can be awkward for large vertical surfaces, increasing the likelihood of unevenness and drips on walls.
- B. Heavy coats can lead to runs, sags, and prolonged drying times, and still may leave roller marks.
- D. Rolling only vertically without overlapping or filling in would leave holidays (unpainted areas) and an uneven finish.
Roller Application Technique ('W' Pattern)
A common painting technique where paint is first distributed onto a surface by rolling in a large 'W' or 'M' shape, then filled in, and finally 'laid off' with light, even strokes in one direction for a smooth finish.
- Ensures even paint distribution and coverage.
- Helps maintain a wet edge to prevent lap marks.
- Laying off minimizes roller texture and streaks.
Memory trick: W's and M's, then smooth it with ease, for a finish that will please.