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Efflorescence/ Mottling

Crusty, white salt deposits, leached from mortar or masonry as water passes through it.

Possible Cause:
Failure to adequately prepare surface by removing all previous efflorescence.
Excess moisture escaping through the exterior masonry walls from the inside.

If excess moisture is the cause, eliminate the source by repairing the roof, cleaning out gutters and downspouts, and sealing any cracks in the masonry with a high quality, water-based, all-acrylic or other paintable caulk.
If moist air is originating inside the building, consider installing vents or exhaust fans, especially in the kitchen, bathroom and laundry areas. A moisture-barrier paint might also be considered for the exterior wall.
Remove the efflorescence and all other loose material with a wire brush, power brush or power washer; then thoroughly rinse the surface.
Apply a quality primer and sealer and allow it to dry completely, then apply an exterior masonry paint.

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