Bubbles resulting from localized loss of adhesion and lifting of the paint film from the underlying surface.
> Painting a warm surface in direct sunlight.
> Application of an oil-based or alkyd paint over a damp
or wet surface.
> Moisture escaping through the exterior wall (less likely with latex paint than with oil-based or
> Exposure or latex paint film to dew, high humidity or rain shortly after paint has dried,
especially if there was inadequate surface preparation.
> If blisters go down to the substrate, try to remove the source of moisture. Repair loose
caulking; consider installing an exhaust fan. Remove blisters.
> If blisters do not go all the way down to the substrate, remove them by scraping, then
sanding; prime any bare wood and repaint with a quality exterior paint.
Source: Paint Quality Institute