Surface PreparationQuestion 8 of 100
How should mildew on an exterior surface be treated BEFORE repainting?
a.Paint directly over it with two coats of the finish
b.Sand it off dry and leave the residue
c.Kill and remove it by cleaning the surface, commonly with a bleach-and-water or dedicated cleaning solution, then rinse
d.Cover it with clear caulk
Explanation
Mildew is a living fungus; painting over it lets it grow through the new coating. It must be killed and washed off, often using a diluted bleach solution or a commercial mildew cleaner, followed by a thorough rinse. Using a mildew-resistant coating helps prevent regrowth in damp areas.
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