Blistering Exterior Paint - Causes and SolutionsBy Kevin Dressel - March 2nd, 2013
Bubbles result from a loss of adhesion, and lifting of the paint film from the underlying surface. There are a variety of possible causes for blistering and paint bubbles. Listed are some of the most common.
- The surface was too warm and painted in hot direct sun
- Application of oil-based or alkyd paint over a damp or wet surface
- Moisture escaping through the exterior walls
- Exposure of latex paint film to dew, high humidity, or rain shortly after paint has dried, especially if there was inadequate surface preparation
The solutions to the blistering are:
- If the blisters go all the way down to the substrate you then need to determine and remove the source of moisture. (reference our article titled "Peeling Exterior Paint - Reasons and solution" for moisture problem solutions.
- If blisters do not go all the way down to the substrate, then you can remove them by scraping, sanding, spot priming, and repainting with a lower solid and sheen acrylic latex paint. The lower solids and sheen paints allow more air flow through a loose paint film, improving breath-ability.
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