Paint Problem: Blistering

Blistering refers to dome shaped paint bubbles indicating loss of adhesion. It can occur in isolation or in groups.

Blistering Paint: What is it & How To Fix it Pat McDonnell Paints

Blistering is typically caused by:

  • Trapped moisture trying to escape through the paint.
  • Painting at temperatures above 32 degrees.
  • Using oil paints on wet/damp surfaces.
  • High humidity, such as rain or heavy dew before the paint dries.
  • Painting a warm surface in direct sunlight.
  • Application over heavy chalk.

Blistering Solution

  • Find and remove the sources of moisture.
  • Control moisture with adequate venting
  • Stopping leaks and acrylic caulking
  • Remove all blistered areas and other loose paint by scraping and sanding
  • Power washing reccommended for large areas.

Primers & Exterior Finishes

  • Priming is essential for better adhesion, sheen uniformity, mildew control and durability.
  • Select a top quality exterior paint in the colour and sheen of your choice.
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