Surface PreparationCâu 15 / 100
New galvanized (zinc-coated) steel often needs what preparation before painting to avoid adhesion failure?
a.Coating immediately while still oily
b.Applying block filler
c.Cleaning to remove oils and using a primer compatible with galvanized metal (or allowing weathering)
d.Sanding it to bare steel
Giải thích
Fresh galvanized surfaces carry oils and a smooth zinc layer that ordinary paint will not grip, so oil-based paints may peel. The surface should be cleaned of oils and coated with a primer formulated for galvanized metal. Some specifications allow the metal to weather before painting.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
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