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Exterior Paint Problem Solver
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Blistering
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Bubbles resulting from localized loss of adhesion and lifting of the paint film from the underlying surface.
Possible Cause:
Applying oil-based or alkyd paint over a damp or wet surface.
Moisture seeping into the home through the exterior walls (less likely with latex paint).
Exposure of latex paint film to high humidity or moisture shortly after paint has dried, especially if there was inadequate surface preparation.
Solution:
Remove blisters by scraping or sanding. Test the adhesion of the paint on the surrounding areas by applying a length of tape on the surface and removing it with a quick motion. If there is a large-scale lack of adhesion, the entire surface should be scraped and sanded. Prime the surface with a quality latex or oil primer. Repaint with interior wall and trim paint.
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