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C-33 – Painting and Decorating Contractor Exam
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR-JUST RELEASED
C-33 – Painting and Decorating Contractor Exam, based on actual exam coverage (surface preparation,
coating types, application methods, safety, substrate issues, VOC regulations, job estimating, equipment
handling, and contract admin).
1. Which type of roller cover nap is best for applying paint to a rough stucco exterior?
A) 1/4-inch nap
B) 3/8-inch nap
C) 1/2-inch nap
D) 3/4-inch nap
Correct: D – Rough surfaces need longer nap (3/4” or 1”) to push paint into deep texture; shorter naps
skip voids.
2. What is the primary purpose of back-rolling when spraying paint on porous masonry?
A) To create an orange-peel texture
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B) To reduce paint consumption
C) To ensure penetration and even film thickness
D) To speed up drying
Correct: C – Back-rolling forces coating into pores and levels the film for uniform coverage.
3. A painter notices bubbling on a freshly painted wall. The most likely cause is:
A) Paint applied too thickly
B) Surface temperature above 100°F during application
C) Moisture trapped under the coating or solvent pop
D) Using a synthetic brush
Correct: C – Blistering/bubbling often comes from moisture escape or solvent entrapment, especially on
damp substrates.
4. For a high-gloss oil-based enamel, the recommended solvent for cleanup is:
A) Denatured alcohol
B) Mineral spirits
C) Lacquer thinner
D) Xylene
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Correct: B – Mineral spirits is the standard thinner/cleaner for oil-based paints; lacquer thinner is too
aggressive.
5. Which federal regulation directly limits volatile organic compound (VOC) content in architectural
coatings?
A) Clean Water Act
B) National Emission Standards for Hazardous Air Pollutants
C) Architectural Coatings Rule under Clean Air Act
D) Resource Conservation and Recovery Act
Correct: C – The EPA’s Architectural Coatings Rule (40 CFR 59 Subpart D) sets VOC limits; states like
CARB have similar.
6. When drywall mud has not fully dried before painting, what defect is most likely?
A) Chalking
B) Cracking and peeling
C) Foaming
D) Saponification
Correct: B – Trapped moisture escapes through paint film, causing adhesion loss, cracking, and peeling.
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7. Which brush fiber is most suitable for applying waterborne acrylic paints?
A) China bristle
B) Tapered polyester or nylon
C) Natural hog bristle
D) Horsehair
Correct: B – Synthetic filaments (polyester/nylon) resist water absorption and maintain stiffness; natural
bristles soften and swell in waterborne paints.
8. To achieve a fine finish on an open-grain wood (oak) with a dark stain, you should first apply:
A) A vinyl sealer
B) A wood filler or grain filler
C) A shellac wash coat
D) A glaze coat
Correct: B – Grain filler seals open pores, preventing excessive stain absorption and creating smooth
surface.
9. What is the minimum recommended dry film thickness for a typical exterior latex house paint on
wood siding?
C-33 – Painting and Decorating Contractor Exam
COMPLETE QUESTIONS AND DETAILED SOLUTIONS
LATEST UPDATE THIS YEAR-JUST RELEASED
C-33 – Painting and Decorating Contractor Exam, based on actual exam coverage (surface preparation,
coating types, application methods, safety, substrate issues, VOC regulations, job estimating, equipment
handling, and contract admin).
1. Which type of roller cover nap is best for applying paint to a rough stucco exterior?
A) 1/4-inch nap
B) 3/8-inch nap
C) 1/2-inch nap
D) 3/4-inch nap
Correct: D – Rough surfaces need longer nap (3/4” or 1”) to push paint into deep texture; shorter naps
skip voids.
2. What is the primary purpose of back-rolling when spraying paint on porous masonry?
A) To create an orange-peel texture
, Page 2 of 122
B) To reduce paint consumption
C) To ensure penetration and even film thickness
D) To speed up drying
Correct: C – Back-rolling forces coating into pores and levels the film for uniform coverage.
3. A painter notices bubbling on a freshly painted wall. The most likely cause is:
A) Paint applied too thickly
B) Surface temperature above 100°F during application
C) Moisture trapped under the coating or solvent pop
D) Using a synthetic brush
Correct: C – Blistering/bubbling often comes from moisture escape or solvent entrapment, especially on
damp substrates.
4. For a high-gloss oil-based enamel, the recommended solvent for cleanup is:
A) Denatured alcohol
B) Mineral spirits
C) Lacquer thinner
D) Xylene
, Page 3 of 122
Correct: B – Mineral spirits is the standard thinner/cleaner for oil-based paints; lacquer thinner is too
aggressive.
5. Which federal regulation directly limits volatile organic compound (VOC) content in architectural
coatings?
A) Clean Water Act
B) National Emission Standards for Hazardous Air Pollutants
C) Architectural Coatings Rule under Clean Air Act
D) Resource Conservation and Recovery Act
Correct: C – The EPA’s Architectural Coatings Rule (40 CFR 59 Subpart D) sets VOC limits; states like
CARB have similar.
6. When drywall mud has not fully dried before painting, what defect is most likely?
A) Chalking
B) Cracking and peeling
C) Foaming
D) Saponification
Correct: B – Trapped moisture escapes through paint film, causing adhesion loss, cracking, and peeling.
, Page 4 of 122
7. Which brush fiber is most suitable for applying waterborne acrylic paints?
A) China bristle
B) Tapered polyester or nylon
C) Natural hog bristle
D) Horsehair
Correct: B – Synthetic filaments (polyester/nylon) resist water absorption and maintain stiffness; natural
bristles soften and swell in waterborne paints.
8. To achieve a fine finish on an open-grain wood (oak) with a dark stain, you should first apply:
A) A vinyl sealer
B) A wood filler or grain filler
C) A shellac wash coat
D) A glaze coat
Correct: B – Grain filler seals open pores, preventing excessive stain absorption and creating smooth
surface.
9. What is the minimum recommended dry film thickness for a typical exterior latex house paint on
wood siding?
