Blistering – A common Paint Problem

“Blistering” – bubbles that results from localized loss of adhesion of the paint from the surface and the subsequent lifting of the paint film from the underlying surface.

blistering

POSSIBLE CAUSES:
•    Painting a warm surface in direct sunlight.
•    Application of oil-based or alkyd paint over a damp or wet surface.
•    Moisture escaping through the exterior walls (less likely with latex paint than with oil-based or alkyd paint).
•    Exposure of latex paint film to dew, high humidity or rain shortly after paint has dried, especially if there was inadequate surface preparation.

SOLUTION:
•    If blisters go down to the substrate: try to remove the source of moisture. Repair loose caulking; consider installing vents or exhaust fans. Remove blisters.
•    If blisters do not go all the way down to the substrate: remove them by scraping, then sanding, prime bare wood and repaint with a quality latex exterior paint such as Edgechem Color Glow Premium Flat or Low Sheen Emulsion.

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