Surface PreparationCâu 10 / 100
Why should glossy or previously enamel-painted surfaces be 'de-glossed' before recoating?
a.A dull, abraded surface gives the new coat a better mechanical bond
b.It adds gloss to the finish coat
c.It removes the need to clean the surface
d.It changes the color of the substrate permanently
Giải thích
Sanding or using a liquid deglosser scuffs a slick, glossy surface so the new coat can grip it mechanically. Painting over an untreated high-gloss surface often results in poor adhesion and peeling. Cleaning to remove contaminants is still required in addition to deglossing.
Luyện miễn phí toàn bộ 100 câu hỏi — không cần đăng ký.
Câu hỏi liên quan cùng chủ đề
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