CSLB C-33 Painting & DecoratingSurface PreparationMedium
A painting contractor is preparing an interior plaster wall for repainting. They notice several areas where the existing paint is peeling and flaking, but the underlying plaster is sound. What is the most important initial step to address these areas?
- AFill the peeling areas with lightweight spackling compound.
- BScrape off all loose and flaking paint, then feather the edges.
- CApply a bonding primer directly over the peeling paint.
- DWash the entire wall with a strong detergent solution.
Show answer & explanationAnswer & explanation
Correct answer: B. Scrape off all loose and flaking paint, then feather the edges.
When paint is peeling and flaking, the loose material must be physically removed to ensure the new paint adheres to a sound surface. Scraping off all loose paint and feathering the edges prevents the new paint from peeling prematurely and creates a smooth transition.
Why the other options are wrong
- A. Filling over peeling paint is incorrect; the loose paint must be removed first before any filling or patching.
- C. Applying primer over loose paint will not solve the adhesion issue and the new paint will also peel.
- D. Washing is important, but only after loose paint has been removed; washing loose paint can spread debris.
Loose Paint Removal
The process of physically removing any paint that is peeling, flaking, or poorly adhered to a substrate before repainting.
- Crucial for long-term paint adhesion.
- Involves scraping, sanding, or wire brushing.
- Feathering edges creates a smooth transition.
Memory trick: Scrape the old, feather the line, for a new paint design.