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.
Have a paint problem and need answers? Sound off in the comment section below or contact us for more information


  1. pat murphy 20th September 2017 at 8:47 am - Reply

    Whats a good primer to use?

    • Orlaith @ Pat McDonnell Paints 26th September 2017 at 9:34 am - Reply

      Hi Pat! We would recommend Zinsser 123 Primer – it’s the best and available in each of our seven stores!

  2. Konrad Jay 26th September 2017 at 4:44 pm - Reply

    Will def be using these tips thanks Orlaith and co, next blog should be about other problems handy to know cheers

    • Orlaith @ Pat McDonnell Paints 27th September 2017 at 8:45 am - Reply

      Thanks Konrad, we will be updating the blog with more painting tips soon!

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