Surface PreparationCâu 12 / 100
What is the purpose of a primer/sealer on new, unpainted drywall?
a.To make the wall glossy
b.To equalize porosity between the paper and joint compound so the finish coat looks uniform
c.To replace the need for taping joints
d.To add texture to the finish
Giải thích
New drywall has paper facing and joint compound with different absorption rates; without a sealer the finish coat flashes and shows joints. A drywall primer/sealer (PVA primer) evens out porosity so the topcoat dries to a uniform sheen. It also improves adhesion of the finish coat.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
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- Why is it poor practice to paint over a wall contaminated with grease or oil?
- New galvanized (zinc-coated) steel often needs what preparation before painting to avoid adhesion failure?
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