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Flaking and Powdering: Concrete/Masonry    << Back Description: The surface appears to be flaking/powdering or there is discoloration within one year after new paint job. Cause: It is possible improper paint may have been used. The surface was cleaned with an acidic solution and not properly rinsed prior to coating. Excessive moisture without adequate venting or evidence of a design flaw of structure. The pH level was too high in the masonry. The material was over thinned. Prevention: Use the correct grade / quality coating for the situation. After any acid cleaning, always use a neutralizing rinse of Tri-Sodium Phosphate and water. Eliminate the source of moisture. Cure: Strip the surface, clean the surface, prime & top-coat.    Courtesy of The Rohm and Haas Paint Quality Institute Click on Image for Larger View