CSLB C-33 Painting & DecoratingSurface PreparationEasy
A painting contractor is preparing an interior wall that has extensive grease and nicotine stains. Which of the following cleaning agents is most appropriate for effectively removing these contaminants prior to priming?
- AMild dish soap and water
- BBleach and water solution
- CTri-sodium phosphate (TSP) substitute
- DWhite vinegar solution
Show answer & explanationAnswer & explanation
Correct answer: C. Tri-sodium phosphate (TSP) substitute
Tri-sodium phosphate (TSP) or its substitutes are highly effective degreasers and are specifically recommended for cleaning surfaces contaminated with heavy grease and nicotine, ensuring proper adhesion of subsequent coatings.
Why the other options are wrong
- A. Mild dish soap may not be strong enough to cut through heavy grease and nicotine effectively.
- B. Bleach is a disinfectant and whitener, but not an effective degreaser for heavy grease and nicotine stains.
- D. White vinegar is an acidic cleaner, effective for mineral deposits or mold, but less so for heavy grease and nicotine.
Heavy-Duty Cleaning Agents
Chemical solutions designed to remove tough contaminants like grease, nicotine, and heavy grime from surfaces before painting.
- TSP and its substitutes are common examples.
- Essential for proper adhesion of new paint.
- Requires proper ventilation and personal protective equipment.
Memory trick: Grease and grime need a 'TSP' touch to shine.