How to Prep a Chalky Wall so New Paint will Adhere Properly

Ever try to re-paint over a chalky wall and get this powdery chakly mess on your hands or clothes?


If so, before painting you’ll need to apply a primer specifically designed to neutralize the cause of the problem. The cause is typically due to moisture and over time will result in efflorescence and/or mold, and can be a health risk. Rainguard offers the solution in the form of specially formulated Chalky Wall Sealer, available here at


CHALKY WALL SEALER is a high-performance clear acrylic primer and penetrating sealer for application on painted and unpainted surfaces.

It is a restorer that provides a tough, durable finish on wood and masonry surfaces.  Apply to chalky surfaces to aid in adhesion for latex top coats.

It penetrates and bonds residual chalk to prepare for repainting.

Product Features:

  • Flexible and breathable
  • Helps prevent efflorescence
  • Protects wood from swelling, shrinking, or grain raising
  • Seals and binds chalked surfaces; improves adhesion of topcoat materials
  • May be used on previously painted and properly prepared surfaces
  • May be applied to concrete or stucco as a curing agent to promote hardening
  • UV protectant
  • Architectural / CSI Reference: Division 3, 4, 7 & 9
  • 5 year material and labor warranty
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