BLISTERING:
Bubbles resulting from localised loss of adhesion, and lifting of the paint film from the underlying surface.

POSSIBLE CAUSES:
• Applying solvent-based paint over a damp or wet surface.

• Moisture seeping into the home through the exterior walls (less likely with water-based paint).

• Exposure of water-based paint film to high humidity or moisture shortly after paint has dried, especially if there was inadequate surface preparation.

SOLUTION:
• If blisters do not go all the way down to the substrate: Remove blisters by scraping, and sanding, and repaint with a quality acrylic water-based interior paint.

• If blisters go down to the substrate: Remove the source of moisture, if possible. Repair loose sealants; consider installing vents or exhaust fans. Remove blisters as above, remembering to prime before applying the top coat.

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