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Mottling

Mottling

Deposition of salts on masonry surfaces. Crusty white salt deposits, leached from mortar or masonry as water passes through it.

Causes:

• Appear on new brick, plaster or cement as they dry.
• Improper curing.
• Failure to adequately prepare surface by removing all previous efflorescence.
• Excess moisture escaping through the exterior masonry walls from the inside.
• Alkaline bricks

Solution:

The source of moisture must be repaired before any paint preparation. If excess moisture is the cause, eliminate the source, sealing any cracks in the masonry with sand and cement. If moist air is originating inside the building, consider installing vents or exhaust fans, especially in the kitchen, bathroom and laundry areas. Remove the efflorescence and all other loose materials with a wire brush, power brush or power washer; then thoroughly rinse the surface.
Apply a coat of Wall Sealer and allow it to dry completely; then apply a coat of top quality exterior paint.