A painting contractor is preparing an interior wall that was previously painted with a heavily textured finish (e.g., popcorn ceiling material) which is now flaking in several areas. The client wants a smooth finish. What is the most effective and efficient method to prepare this surface?
- AScraping off the loose texture, then applying a skim coat of joint compound.
- BWashing the surface thoroughly with a degreaser and then painting.
- CPower sanding the entire surface with an orbital sander and 80-grit paper.
- DApplying a thick layer of high-build primer over the existing texture.
Show answer & explanationAnswer & explanation
Correct answer: A. Scraping off the loose texture, then applying a skim coat of joint compound.
For flaking, heavily textured finishes where a smooth surface is desired, the most effective method is to first remove all loose material by scraping. Then, applying one or more skim coats of joint compound will fill the remaining texture and create a smooth, paintable surface. High-build primer won't adequately smooth a heavily textured, flaking surface. Power sanding is messy and may not fully remove the texture or create a smooth enough finish. Washing cleans but doesn't remove texture or flaking material.
Why the other options are wrong
- B. Washing only cleans the surface; it does not remove texture or flaking material, which are necessary steps for a smooth finish.
- C. Power sanding can be extremely messy, generate excessive dust, and may not fully remove the texture or create a smooth finish without significant effort and potential damage.
- D. A high-build primer is good for minor imperfections but cannot effectively smooth a heavily textured, flaking surface.
Textured Wall Smoothing
To achieve a smooth finish over a flaking, heavily textured wall, first remove loose material by scraping, then apply skim coats of joint compound to level the surface.
- Loose texture must be removed.
- Skim coating fills and smooths.
- Multiple thin coats are better than one thick coat.
Memory trick: Flaking texture's fall means a skim coat's call for a smooth wall.