CSLB C-33 Painting & DecoratingSurface PreparationEasy
A painting contractor is preparing an interior plaster wall that has several small, non-moving cracks, typically less than 1/16 inch wide. The client wants a smooth finish. What is the most appropriate material to fill these cracks before priming?
- ADrywall joint compound
- BAcrylic latex caulk
- CEpoxy filler
- DSpackling paste
Show answer & explanationAnswer & explanation
Correct answer: D. Spackling paste
Spackling paste is ideal for filling small, non-moving cracks and nail holes in plaster or drywall, providing a smooth finish that can be easily sanded and painted.
Why the other options are wrong
- A. Drywall joint compound is typically used for taping seams and larger areas, and may shrink more in small cracks.
- B. Acrylic latex caulk is flexible and used for sealing gaps where movement is expected, not for filling non-moving cracks in a wall surface that needs to be sanded smooth.
- C. Epoxy filler is generally used for structural repairs or very large, deep cracks, and is overkill for small hairline cracks.
Spackling Paste
A gypsum-based or vinyl-based compound used to fill small holes, cracks, and imperfections in interior walls and ceilings.
- Dries quickly and sands easily to a smooth finish.
- Suitable for plaster, drywall, and wood.
- Not designed for structural repairs or moving joints.
Memory trick: Small crack? Spackle it back, then smooth and paint, no turning back.