Why is there a white or powdery substance on some areas of my wall

White (powdery) substance on the substrate of concrete, brick, masonry and plaster. The efflorescence, which comes from the migration of salts, can lift the paint from the substrate.

What are the possible causes?

• Soluble salts within the substrate. Moisture brings the salts to the surface of the substrate resulting in coating shows the efflorescence appearance and adhesion failure.
• Excess moisture entrapped in the substrate will escape through the wall.
• Insufficient curing of new concrete cement wall.

How can I fix the problem?

• Remove all powdery substances and thoroughly clean the surface.
• Ensure surface is moisture free, clean and suitable for application.
• Remove or eliminate the source of moisture.
• Apply a suitable sealer and coating system formulated for concrete, masonry etc.