Surface PreparationCâu 11 / 100
Bare ferrous (iron/steel) metal should be primed with what type of primer to prevent corrosion?
a.A drywall sealer
b.A masonry block filler
c.A rust-inhibitive metal primer
d.A latex wood primer only
Giải thích
Ferrous metals rust when exposed to moisture and oxygen, so a rust-inhibitive (corrosion-resistant) primer is used to protect the steel and provide adhesion for the topcoat. Block fillers and drywall sealers are formulated for masonry and gypsum, not metal. Surface rust should be removed before priming.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
- 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?
- What is the purpose of a primer/sealer on new, unpainted drywall?
- Loose, flaking paint on old siding should be handled how before recoating?
- Why is it poor practice to paint over a wall contaminated with grease or oil?
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