CA C-33 Painting & Decorating
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
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1. In the California C-33 Painting and Decorating contractor classification,
which type of work most accurately falls within the classification?
A. Installation of structural steel framing for commercial buildings
B. Installation of underground sewer mains and municipal water pipelines
C. Preparation of surfaces and application of paints, stains, varnishes,
lacquers, protective coatings, and related decorative finishes
D. Installation of complete electrical distribution systems
Rationale: The C-33 classification is centered on painting and decorating
work, including preparation of surfaces and application of various
protective and decorative coatings. The contractor must understand both
surface preparation and the proper application of coating systems.
, 2. A contractor is preparing a previously painted wood surface before
applying a new exterior coating. Which preparation step is generally
most important?
A. Apply the new finish immediately over every existing coating
B. Remove loose or failing material, clean and prepare the surface, and
establish a sound substrate before recoating
C. Saturate the wood with water immediately before painting
D. Cover damaged areas with additional finish without preparation
Rationale: Coating performance depends heavily on surface preparation.
Loose paint, dirt, grease, moisture, and deteriorated material can prevent
adhesion and cause premature peeling or failure.
3. A painting contractor is estimating the wall area of a rectangular room
measuring 20 feet long, 15 feet wide, and 10 feet high. Ignoring doors
and windows, what is the total wall area?
A. 350 square feet
B. 500 square feet
C. 700 square feet
D. 1,000 square feet
Rationale: The perimeter is 2(20 + 15) = 70 feet. Multiplying the perimeter
by the 10-foot wall height gives 700 square feet of wall surface.
, 4. A coating manufacturer states that one gallon of paint covers
approximately 350 square feet per coat. If a contractor must apply
two coats to 700 square feet, approximately how many gallons are
required before allowing for waste?
A. 2 gallons
B. 4 gallons
C. 6 gallons
D. 8 gallons
Rationale: Two coats over 700 square feet represent 1,400 square feet of
coverage. Dividing 1,400 by 350 square feet per gallon gives 4 gallons
before considering application losses, surface porosity, and waste.
5. Why should a painting contractor normally calculate both the quantity
of coating and the expected number of coats during estimating?
A. Coat count has no effect on material consumption
B. The number of coats directly affects material quantities, labor hours,
project duration, and final appearance
C. More coats always reduce the project cost
D. One coat always provides the same performance as a complete coating
system
, Rationale: Each additional coat increases material and labor requirements.
The required number of coats depends on the coating system, substrate,
color, hiding characteristics, and manufacturer requirements.
6. A new drywall surface is ready for painting. What is generally required
before applying the finish coat?
A. Leave joint compound un-sanded
B. Apply exterior masonry sealer only
C. Properly prepare the joints and surface and apply an appropriate
drywall primer or sealer
D. Saturate the drywall with water
Rationale: New drywall and joint-compound areas can absorb paint
differently from the paper surface. Proper finishing and an appropriate
primer or sealer help create uniform absorption and improve the
appearance of the finish coats.
7. What is the primary purpose of primer in a painting system?
A. Replace all surface preparation
B. Improve adhesion, seal or condition the substrate, promote uniform
appearance, and provide an appropriate base for the finish coat
C. Eliminate the need for finish coats
D. Increase the moisture content of the substrate
Contractor Exam Practice Questions
And Correct Answers (Verified Answers)
Plus Rationale 2027 Q&A| Instant
Download Pdf.
1. In the California C-33 Painting and Decorating contractor classification,
which type of work most accurately falls within the classification?
A. Installation of structural steel framing for commercial buildings
B. Installation of underground sewer mains and municipal water pipelines
C. Preparation of surfaces and application of paints, stains, varnishes,
lacquers, protective coatings, and related decorative finishes
D. Installation of complete electrical distribution systems
Rationale: The C-33 classification is centered on painting and decorating
work, including preparation of surfaces and application of various
protective and decorative coatings. The contractor must understand both
surface preparation and the proper application of coating systems.
, 2. A contractor is preparing a previously painted wood surface before
applying a new exterior coating. Which preparation step is generally
most important?
A. Apply the new finish immediately over every existing coating
B. Remove loose or failing material, clean and prepare the surface, and
establish a sound substrate before recoating
C. Saturate the wood with water immediately before painting
D. Cover damaged areas with additional finish without preparation
Rationale: Coating performance depends heavily on surface preparation.
Loose paint, dirt, grease, moisture, and deteriorated material can prevent
adhesion and cause premature peeling or failure.
3. A painting contractor is estimating the wall area of a rectangular room
measuring 20 feet long, 15 feet wide, and 10 feet high. Ignoring doors
and windows, what is the total wall area?
A. 350 square feet
B. 500 square feet
C. 700 square feet
D. 1,000 square feet
Rationale: The perimeter is 2(20 + 15) = 70 feet. Multiplying the perimeter
by the 10-foot wall height gives 700 square feet of wall surface.
, 4. A coating manufacturer states that one gallon of paint covers
approximately 350 square feet per coat. If a contractor must apply
two coats to 700 square feet, approximately how many gallons are
required before allowing for waste?
A. 2 gallons
B. 4 gallons
C. 6 gallons
D. 8 gallons
Rationale: Two coats over 700 square feet represent 1,400 square feet of
coverage. Dividing 1,400 by 350 square feet per gallon gives 4 gallons
before considering application losses, surface porosity, and waste.
5. Why should a painting contractor normally calculate both the quantity
of coating and the expected number of coats during estimating?
A. Coat count has no effect on material consumption
B. The number of coats directly affects material quantities, labor hours,
project duration, and final appearance
C. More coats always reduce the project cost
D. One coat always provides the same performance as a complete coating
system
, Rationale: Each additional coat increases material and labor requirements.
The required number of coats depends on the coating system, substrate,
color, hiding characteristics, and manufacturer requirements.
6. A new drywall surface is ready for painting. What is generally required
before applying the finish coat?
A. Leave joint compound un-sanded
B. Apply exterior masonry sealer only
C. Properly prepare the joints and surface and apply an appropriate
drywall primer or sealer
D. Saturate the drywall with water
Rationale: New drywall and joint-compound areas can absorb paint
differently from the paper surface. Proper finishing and an appropriate
primer or sealer help create uniform absorption and improve the
appearance of the finish coats.
7. What is the primary purpose of primer in a painting system?
A. Replace all surface preparation
B. Improve adhesion, seal or condition the substrate, promote uniform
appearance, and provide an appropriate base for the finish coat
C. Eliminate the need for finish coats
D. Increase the moisture content of the substrate
