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. 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
2. What percentage of a commercial interior repaint's total cost typically goes to materials? → 15-25%
3. 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
4. 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
5. 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.
6. An exterior painted surface shows irregular, map-like cracking patterns that expose the substrate. What type of paint failure is this? → Mud cracking
7. What type of insurance is typically required for a painting contractor to protect against claims of defective workmanship? → General Liability Insurance
8. What are the three primary colors in traditional painting color theory? → Red, yellow, and blue
9. What is the minimum square footage of interior painted surface that must be disturbed before the RRP Rule applies? → 6 square feet
10. For applying a water-based (latex) paint, which type of brush bristle is generally recommended for the best results? → Nylon/Polyester Blend
11. Which coating type is most appropriate for a commercial kitchen floor that must withstand chemical spills and heavy traffic? → Epoxy floor coating
12. 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
13. What does VOC stand for in paint and coating regulations? → Volatile Organic Compound
14. Which California agency primarily regulates VOC content in architectural coatings? → California Air Resources Board (CARB)
15. Before hanging wallcovering on new drywall, what surface treatment is most commonly required? → Apply an acrylic primer-sealer or sizing
16. Which California state agency regulates the advertising practices of C-33 painting contractors? → CSLB (Contractors State License Board)
17. 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
18. A C-33 contractor selects a paint labeled 'DTM.' What does this designation mean? → Direct To Metal - can be applied to properly prepared metal without a separate primer
19. When estimating paint for a room with standard 8-foot ceilings, which shortcut formula gives approximate wall area? → Room perimeter x ceiling height, minus 20 sq ft per door and 15 sq ft per window
20. How must lead-contaminated debris and waste be handled at the end of a project? → It must be sealed in heavy-duty plastic bags, often double-bagged.
21. Under EPA's RRP Rule, a firm performing renovation that disturbs lead-based paint in pre-1978 housing must be certified by whom? → EPA or an EPA-authorized state program
22. What is the primary purpose of 'booking' a pasted wallcovering strip? → To allow the adhesive to activate and the material to relax before hanging
23. Before painting new, unpainted exterior wood, its moisture content should ideally be below what percentage? → 15%
24. A C-33 contractor needs to apply a smooth finish on interior doors. Which roller nap length is most appropriate? → 1/4 inch or foam roller
25. Grasscloth and natural-fiber wallcoverings require which special seaming consideration not needed for vinyl? → Seams will always show and should be planned to fall in less visible locations
26. What is 'grain raising' and why does it commonly occur with water-based stains and clear coats? → Wood fibers swell and stand up when exposed to water, creating a rough texture
27. What does 'VOC' stand for, and why is it regulated in California painting products? → Volatile Organic Compound - contributes to smog and air pollution
28. What is the primary environmental concern with high-VOC paints used indoors? → They contribute to indoor air pollution and smog formation outdoors
29. Under California law, what are the three accepted methods a C-33 contractor can use to demonstrate financial responsibility to the CSLB? → Contractor's license bond, bond of qualifying individual, or cash deposit
30. A C-33 painting contractor wants to add a partner to their sole proprietorship. What must happen with the CSLB license? → A new license application must be filed for the partnership