Surface PreparationCâu 17 / 100
What is the main reason to remove dust after sanding and before painting?
a.Dust improves paint flow
b.Dust left on the surface prevents proper adhesion and creates a gritty finish
c.Dust changes the sheen of the paint can
d.It is only an aesthetic preference with no effect on adhesion
Giải thích
Sanding dust acts as a contaminant that keeps paint from bonding and leaves a rough, gritty film. Wiping with a tack cloth, vacuuming, or damp-wiping removes the dust for a clean bond and smooth finish. This step is part of preparing a clean, sound surface.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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?
- When patching a larger hole in drywall, why is joint compound often applied in multiple thin coats rather than one thick coat?
- Knots and sap streaks in bare softwood can bleed through paint unless they are sealed with what?
- Why should exterior wood be checked for moisture content before painting?
- What is 'feathering' when preparing a spot repair on a painted surface?
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