CSLB C-33 Painting & DecoratingSurface PreparationEasy
A painting contractor is preparing to paint the exterior of an older commercial building. During the initial inspection, they notice several areas where the existing paint is blistered and peeling. Which of the following is the most appropriate first step to address these specific issues before applying new paint?
- APressure wash the entire surface to remove all existing paint.
- BFill all blistered areas with an exterior caulk and then sand smooth.
- CApply a high-build primer directly over the peeling paint to encapsulate it.
- DScrape away all loose and peeling paint, then feather-edge the remaining paint.
Show answer & explanationAnswer & explanation
Correct answer: D. Scrape away all loose and peeling paint, then feather-edge the remaining paint.
Before applying any new coatings, all loose and failing existing paint must be removed to ensure proper adhesion of the new paint. Feather-edging creates a smooth transition.
Why the other options are wrong
- A. Pressure washing alone may not remove all loose paint and can damage the substrate; scraping is more targeted and effective for peeling paint.
- B. Caulk is not designed to fill broad areas of blistering or peeling paint; it's typically for cracks and gaps.
- C. Applying primer over loose paint will not solve the adhesion issue and the new paint will also fail.
Loose Paint Removal
The process of physically removing all non-adhering paint from a substrate to prepare it for a new coating.
- Crucial for new paint adhesion.
- Methods include scraping, wire brushing, sanding.
- Followed by feather-edging for smooth transitions.
Memory trick: Sound surface, lasting finish.