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Blisters
 
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Description:
The presence of dome shaped paint bubbles that indicate a loss of adhesion.

Cause:
Moisture or vapor has been trapped caused by the following:
  • Rain
  • High humidity
  • Wet surface
  • Painting when temperature is too high
  • The surface has not been properly cleaned


Prevention:
Eliminate the source of the moisture. Control the moisture below the substrate by venting, removing leaks and caulking.

Cure:
Remove all of the affected areas by scraping and sanding the surface. Power washing may be necessary.

  
Courtesy of The Rohm and Haas Paint Quality Institute

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