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White deposits (soluble salts) that appear on concrete, brick, block, stucco, mortar and other masonry surfaces when exposed to moisture. In addition to creating an unattractive appearance, deposits can grow and will cause adhesion problems if not properly removed before repainting.


  • Failure to properly prepare the surface by removing all previous salt deposits
  • Excess moisture escaping through exterior masonry walls from the inside
  • Painting masonry surfaces before they are fully cured
  • Remove the efflorescence and all other loose material (dirt, unbound sand and deteriorated paint, etc.) with a wire brush, a power brush or power washer; if a wire brush is used, follow by thoroughly rinsing the surface.
  • Wash the surface with a solution of one part phosphoric acid to seven parts water (for safety, always add the acid to the water; never add the water to the acid). Citric acid is the safest and easiest to use; however, it is slightly less effective.
  • Rinse thoroughly with clean water.
  • Allow the surface to dry completely.
  • If efflorescence still exists, repeat above steps.
  • Seal the surface with a high-quality primer designed to hold back efflorescence.
  • Repaint with a premium-quality acrylic finish.

Phosphoric acid will burn the eyes and skin. Always wear protective clothing, goggles, rubber gloves and boots when acid-washing.

Product Recommendations

Surface Recommended Primer
Masonry EFF-STOP® Premium
Masonry SUPER-LOC®
Desired Finish Recommended Product
Flat EVERSHIELD® Exterior Flat Paint
Velvet EVERSHIELD® Exterior Velvet Paint
Eggshell EVERSHIELD® Exterior Eggshell Paint
Low Sheen EVERSHIELD® Exterior Low Sheen Paint
Semi-Gloss EVERSHIELD® Exterior Semi-Gloss Paint
Gloss EVERSHIELD® Exterior Gloss Paint

Please note that these suggestions are provided as a service to you. We are unable to guarantee or be responsible for the results obtained by these procedures. If you have additional questions, ask any of our expert sales associates.