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100+ Free C-33 Painting and Decorating Practice Questions

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2026 Statistics

Key Facts: C-33 Painting and Decorating Exam

28%

Planning & Estimating

CSLB Study Guide

30%

Surface Preparation

CSLB Study Guide

21%

Application Methods

CSLB Study Guide

21%

Safety & Regulations

CSLB Study Guide

3.5 hrs

Exam Time Limit

CSLB Study Guide

4 yrs

Required Experience

CSLB Application

The C-33 Painting and Decorating examination is a 3.5-hour computer-delivered test administered by PSI. It requires 4 years of journey-level experience, a $450 application fee, and covers planning, estimating, surface prep, application of paint and finishes, and safety regulations.

Sample C-33 Painting and Decorating Practice Questions

Try these sample questions to test your C-33 Painting and Decorating exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A painter needs to achieve a specified dry film thickness (DFT) of 4.0 mils using an acrylic coating that contains 50% solids by volume. What wet film thickness (WFT) must be applied?
A.8.0 mils WFT
B.6.0 mils WFT
C.5.0 mils WFT
D.2.0 mils WFT
Explanation: Wet film thickness is calculated using the formula WFT = DFT / (% Solids by Volume). Dividing 4.0 mils by 0.50 yields 8.0 mils WFT. Measuring WFT during application ensures the final cured film meets structural specification requirements.
2A coating has a theoretical spreading rate of 400 sq ft per gallon at 2.0 mils DFT. If an estimator factors in a 20% surface waste and loss factor, what is the net practical spreading rate?
A.480 sq ft per gal
B.320 sq ft per gal
C.300 sq ft per gal
D.250 sq ft per gal
Explanation: Practical spreading rate accounts for material loss due to surface roughness, overspray, and equipment residue using the formula Practical Rate = Theoretical Rate * (1 - Loss Factor). Multiplying 400 sq ft/gal by (1 - 0.20) gives a net practical coverage of 320 sq ft per gallon. Accurate loss estimations prevent material shortages during application.
3An estimator is calculating wallcovering quantity for a room with 600 sq ft of net wall area. Using commercial wallcovering rolls that yield 48 usable sq ft per roll after pattern matching, how many single rolls are required?
A.10 single rolls
B.13 single rolls
C.11 single rolls
D.16 single rolls
Explanation: To determine the required wallcovering rolls, divide total net wall area by the usable area per roll: 600 sq ft / 48 sq ft per roll = 12.5 rolls. Estimating standards dictate rounding up to the next full roll, resulting in 13 single rolls. Accounting for pattern repeat waste ensures continuous strip installation without mismatching.
4A commercial exterior wall measures 50 feet long by 20 feet high and contains four windows measuring 5 feet by 4 feet each. What is the net surface area to be painted?
A.1,000 square feet
B.960 square feet
C.940 square feet
D.920 square feet
Explanation: Gross surface area is 50 ft * 20 ft = 1,000 sq ft. Deducting the area of four windows (4 * (5 ft * 4 ft) = 80 sq ft) yields a net painting surface area of 920 sq ft. Deducting unpainted openings prevents overestimating coating quantities and labor costs.
5A contractor estimates an interior spray painting project of 12,000 sq ft. If a two-person crew achieves a production rate of 1,500 sq ft per hour, how many total crew labor hours are required?
A.16 labor hours total
B.20 labor hours total
C.24 labor hours total
D.32 labor hours total
Explanation: Project duration is 12,000 sq ft / 1,500 sq ft per hour = 8 elapsed project hours. Since it is a two-person crew, total crew labor hours equal 8 hours * 2 workers = 16 total labor hours. Accurate labor conversion is essential for payroll and bid pricing.
6Under South Coast Air Quality Management District (SCAQMD) Rule 1113, what is the maximum allowable volatile organic compound (VOC) limit for standard flat architectural coatings in Southern California?
A.100 grams per liter
B.50 grams per liter
C.250 grams per liter
D.350 grams per liter
Explanation: SCAQMD Rule 1113 sets strict VOC limits for architectural coatings in Southern California, restricting standard flat coatings to 50 g/L (and non-flat to 100 g/L). Contractors must specify Rule 1113 compliant materials to avoid severe air quality management violation fines.
7A painter thins 1 gallon of paint (originally 60% solids by volume) with 10% solvent by volume. What is the new effective volume solids percentage of the thinned mixture?
A.66.0 percent solids
B.58.5 percent solids
C.54.5 percent solids
D.50.0 percent solids
Explanation: Adding 10% solvent increases total liquid volume to 1.1 gallons while solid volume remains 0.60 gallons. The new volume solids fraction is 0.60 / 1.10 = 54.5%. Thinning reduces the volume solids, requiring higher WFT to achieve target DFT.
8An estimator is calculating the surface area of a triangular building gable with a base width of 30 feet and a vertical height of 12 feet. What is the total area of the gable wall?
A.360 square feet
B.240 square feet
C.210 square feet
D.180 square feet
Explanation: The area of a triangle is calculated as 0.5 * base * height. Multiplying 0.5 * 30 ft * 12 ft equals 180 sq ft. Geometry calculations are necessary for accurate material takeoff on sloped architectural features.
9A concrete masonry unit (CMU) wall requires block filler applied at a rate of 75 sq ft per gallon due to high substrate porosity. How many gallons are required to coat 1,500 sq ft?
A.20 gallons of filler
B.15 gallons of filler
C.25 gallons of filler
D.30 gallons of filler
Explanation: Dividing total surface area by spreading rate (1,500 sq ft / 75 sq ft per gallon) equals 20 gallons. Porous block surfaces absorb significantly more coating than smooth concrete, requiring heavy body block fillers during surface prep planning.
10A paint specification calls for a 3.0 mil DFT. If the paint has 40% solids by volume and 5% solvent reduction, what target WFT should the painter maintain during application?
A.6.5 mils WFT target
B.7.9 mils WFT target
C.8.5 mils WFT target
D.9.2 mils WFT target
Explanation: Effective volume solids after 5% thinning is 40% / 1.05 = 38.1%. Target WFT = 3.0 mils / 0.381 = 7.9 mils. Calculating thinned WFT targets ensures compliance with dry film thickness specifications.

About the C-33 Painting and Decorating Exam

Tests the knowledge and skills necessary to perform painting and decorating work in California, including planning, substrate preparation, application, and safety compliance.

Assessment

Question count not published by the exam provider

Time Limit

3.5 hours

Passing Score

Disclosed at test site

Exam Fee

$450 application fee (California Contractors State License Board (CSLB))

C-33 Painting and Decorating Exam Content Outline

28%

Planning and Estimating

Evaluates knowledge of project planning, reading blueprints, estimating materials and labor, and determining project requirements.

30%

Substrate Repair and Surface Preparation

Assesses knowledge of various substrates, repair techniques, cleaning methods, and surface preparation according to industry standards.

21%

Application of Paint, Wallcoverings, and Finishes

Covers proper application techniques for paints, stains, clear finishes, and wallcoverings, including equipment usage and environmental conditions.

21%

Safety

Tests understanding of Cal/OSHA regulations, hazard communication, safe use of tools and equipment, and handling of hazardous materials.

How to Pass the C-33 Painting and Decorating Exam

What You Need to Know

  • Passing score: Disclosed at test site
  • Assessment: Question count not published by the exam provider
  • Time limit: 3.5 hours
  • Exam fee: $450 application fee

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

C-33 Painting and Decorating Study Tips from Top Performers

1Review Cal/OSHA Title 8 regulations specifically related to painting and scaffolding safety.
2Understand the EPA Lead RRP guidelines for surface preparation on pre-1978 structures.
3Practice reading blueprints and performing area calculations for estimating materials.
4Familiarize yourself with different substrate types (wood, drywall, masonry) and appropriate primers.
5Study environmental compliance rules, such as CARB and SCAQMD VOC limits for coatings.

Frequently Asked Questions

What are the experience requirements for the C-33 exam?

You must have at least 4 years of verifiable journey-level experience in painting and decorating within the last 10 years.

How long is the C-33 examination?

The exam allows 3.5 hours (210 minutes) for completion and is computer-administered.

What is the application fee for the CSLB C-33 license?

The initial application fee is $450, payable to the CSLB.

Does the exam cover lead safety?

Yes, safety is 21% of the exam, which includes lead RRP (Renovation, Repair and Painting) regulations and Cal/OSHA hazardous materials handling.

Can I use reference materials during the test?

No, the CSLB trade exams are closed-book. No reference materials or devices are permitted in the testing center.