Surface Preparation第 10 / 100 题
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
解析
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.
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