CSLB Painting (C-33) Trade — All Questions
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52 questions
A painting contractor is scheduling work inside a building where drywall finishing is still underway. What sequencing problem does that create?
- a.Sanding dust will contaminate wet paint, so the trades must be separated in time✓
- b.Drywall work raises the humidity so much that paint cannot dry
- c.The painter cannot access the walls until all trades have finished
- d.Drywall compound reacts chemically with waterborne primer
Airborne sanding dust settles into wet film and ruins the finish, so painting follows drywall finishing rather than running alongside it. Humidity from drywall work is a minor factor next to the dust. Painters routinely work while other trades are on site, just not during sanding. Compound and primer are chemically compatible; the problem is physical contamination.
Why does an estimator distinguish between the first coat and subsequent coats when calculating material for bare, porous stucco?
- a.The first coat is applied thinner than the coats that follow
- b.Later coats require more material because they must hide the primer
- c.Material calculations use the same rate for every coat by convention
- d.The first coat is absorbed and covers far less area than later coats✓
A porous substrate drinks the first coat, so its coverage rate is much lower than the rate for coats applied over a sealed surface. The first coat is not applied thinner; it is absorbed more. Later coats over a sealed surface stretch further, not less. Using one rate for every coat is exactly the error that leaves a crew short.