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Close up image of patterned cracking in the surface of the paint film resembling the scales of an alligator.

Causes

  • Failure to adequately prepare surface by removing all previous efflorescence.
  • Excess moisture escaping through the exterior masonry walls from the inside.
  • Failure to prime new concrete and masonry surface.

Solutions

  • If excess moisture is the cause, eliminate the source by repairing the roof, cleaning out gutters and downspout, and sealing any cracks in the masonry with high quality, water-based all-acrylic or siliconized acrylic caulk. If moist air is originating inside the building, consider installing vents or exhaust fans, especially in kitchen, bathroom and laundry areas.
  • Remove the efflorescence and all other loose material with a wire brush, power brush or power washer; then thoroughly rinse the surface. There are also commercially-available efflorescence removers that can be used for easy removal of efflorescence.
  • Apply a quality water-based or solvent-based masonry primer & sealer and allow it to dry completely; then apply a coat of top quality exterior house paint, masonry paint or elastomeric wall coating. (Elastomeric wall coatings should not be applied to surfaces that may have excessive moisture coming through, such as soil retaining walls, uncapped walls or interior basement walls).

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What Product Do I Need?
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What Sheen Do I Need?
8 Oz. Sample
1 Gallon
1 Quart
5 Gallon
The following product(s) is required to properly prep uncoated and previously coated concrete surfaces.
Required product
BEHR PREMIUM ALL-IN-ONE WOOD CCCC
$0.00
The following product(s) is required to properly prep uncoated and previously coated concrete surfaces. Only available in store at Home Depot.
Required 3rd party product
BEHR PREMIUM ALL-IN-ONE WOOD CCCC
The 9 in. x 1/4 in. Polyester Adhesive Roller Cover has a hard texture, making it ideal for applying all types of adhesives to smooth surfaces. It can be used for stippling and applying sand paints.
The following product(s) is recommended when a topcoat clear finish is desired.
$0.00
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