Surface PreparationCâu 7 / 100
Before painting new bare wood trim, why is sanding in the direction of the grain important?
a.It smooths raised fibers without leaving cross-grain scratches that show through the finish
b.It removes the need for any primer
c.It increases the moisture content of the wood
d.It darkens the natural color of the wood
Giải thích
Sanding with the grain levels raised fibers and creates a smooth surface without visible cross-grain scratch marks that telegraph through paint. Sanding across the grain leaves scratches that become obvious under a gloss finish. A dust-free, smooth surface improves both appearance and adhesion.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- Under the EPA Renovation, Repair and Painting (RRP) Rule, work that disturbs painted surfaces in housing built before which year generally triggers lead-safe requirements?
- Which work practice is REQUIRED by the EPA RRP Rule when disturbing lead-based paint in a pre-1978 home?
- What causes efflorescence, the white crystalline deposit sometimes seen on masonry and concrete?
- How should mildew on an exterior surface be treated BEFORE repainting?
- What tool or method best confirms whether a concrete slab is dry enough to coat?
- Why should glossy or previously enamel-painted surfaces be 'de-glossed' before recoating?
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