Surface Preparation第 22 / 100 题
Before applying an elastomeric coating to a stucco crack, what prep step is typically needed?
a.Wetting the crack with solvent
b.Cleaning and filling/bridging the crack and ensuring the surface is sound and dry
c.Applying gloss enamel first
d.Sanding the entire wall to bare masonry
解析
Elastomeric coatings bridge hairline cracks but the substrate must first be clean, sound, and dry, with larger cracks filled or reinforced. Loose material and contaminants would cause the thick coating to fail. Proper prep lets the elastomeric film stretch over the crack without delaminating.
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