C33 Cheat Sheet 2026

The 30 highest-yield C33 facts, distilled from real exam questions. Print it, save it as a PDF, or study it here — free, no sign-up.

1. Which condition would MOST likely cause an elastomeric coating to fail prematurely? → Application over active structural cracks wider than 1/4 inch that continue to move
2. Which entity has the authority to investigate and penalize violations of prevailing wage laws on California public works projects? → The Labor Commissioner
3. When a paint thinner or solvent spill occurs on a job site, what is the required action? → Absorb with kitty litter or sand and dispose of as hazardous waste
4. What percentage of a commercial interior repaint's total cost typically goes to materials? → 15-25%
5. Which personal protective equipment (PPE) is required when a painter is sanding or scraping surfaces suspected to contain asbestos-containing material (ACM)? → Full-face supplied-air respirator and disposable coveralls
6. Which chemical solution is most commonly used to remove old vinyl wallcovering that has been applied directly over unprepared drywall? → Enzyme-based wallcovering remover diluted in warm water
7. A painted steel handrail shows rust spots bleeding through the paint within months. What was the most likely preparation failure? → Inadequate removal of mill scale and rust before priming
8. How do you determine the height of the walls in a room when looking at a standard floor plan? → By looking at the elevation or section views.
9. An exterior painted surface shows irregular, map-like cracking patterns that expose the substrate. What type of paint failure is this? → Mud cracking
10. What type of insurance is typically required for a painting contractor to protect against claims of defective workmanship? → General Liability Insurance
11. What are the three primary colors in traditional painting color theory? → Red, yellow, and blue
12. Which document must a California painting contractor have available on site for every chemical product used by employees? → Safety Data Sheet (SDS)
13. What is the minimum square footage of interior painted surface that must be disturbed before the RRP Rule applies? → 6 square feet
14. For applying a water-based (latex) paint, which type of brush bristle is generally recommended for the best results? → Nylon/Polyester Blend
15. Which coating type is most appropriate for a commercial kitchen floor that must withstand chemical spills and heavy traffic? → Epoxy floor coating
16. A homeowner notices a dark, fuzzy growth appearing through a freshly painted bathroom wall. What is the most likely cause? → Mold or mildew growth from moisture not fully remediated before painting
17. When calculating how many double rolls (bolts) of wallcovering are needed for a room, what measurement is typically used to account for doors and windows? → Subtract one single roll for every two standard-sized openings
18. What does VOC stand for in paint and coating regulations? → Volatile Organic Compound
19. A painting contractor is applying a primer in a South Coast AQMD district. What VOC limit applies to interior wood primers? → 150 g/L
20. Which California agency primarily regulates VOC content in architectural coatings? → California Air Resources Board (CARB)
21. Under Cal/OSHA, what is the maximum permissible exposure limit (PEL) for lead in the air of a painting worksite over an 8-hour time-weighted average? → 50 micrograms per cubic meter (μg/m³)
22. Before hanging wallcovering on new drywall, what surface treatment is most commonly required? → Apply an acrylic primer-sealer or sizing
23. When a specification calls for a 'vapor barrier' coating on interior concrete walls, the contractor should select: → High-build epoxy or bituminous coating with very low moisture vapor transmission
24. Which California state agency regulates the advertising practices of C-33 painting contractors? → CSLB (Contractors State License Board)
25. What is the primary legal advantage of incorporating a painting contracting business compared to operating as a sole proprietorship? → Personal assets of owners are protected from business liabilities
26. When preparing previously painted exterior wood for repainting, what level of surface preparation is typically required? → Remove only loose, flaking paint; feather edges and sand glossy areas
27. In the Munsell color system, 'chroma' refers to: → The degree of saturation or colorfulness
28. On a public works project, an apprentice painter may work at a lower wage rate only if they are: → Enrolled in a state-approved apprenticeship program
29. When a specification calls for 'SSPC-SP 3' surface preparation on steel, what does this require? → Power tool cleaning
30. A painting contractor receives a $50,000 contract. Under California law, what is the maximum deposit the contractor can legally collect before starting work? → $1,000 or 10% of the contract price, whichever is less