Interior Decorating - Problem Solving

PAINT BLISTERING

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.

PAINT CRACKING/FLAKING

CRACKING / FLAKING:

The splitting of a dry paint film through at least one coat as a result of aging, which ultimately will lead to complete failure of the paint. In its early stages, the problem appears as hairline cracks; in its later stages, flaking occurs.

POSSIBLE CAUSES:

• Use of lower quality paint that has inadequate adhesion and flexibility.

• Overthinning or overspreading the paint.

• Inadequate surface preparation, or applying the paint to bare wood without first applying a primer.

• Excessive hardening and embrittlement of solvent-based paint as the paint job ages.

SOLUTION:

• Remove loose and flaking paint with a scraper or wire brush, sanding the surface and feathering the edges. If the flaking occurs in multiple layers of paint, use of a face filler may be necessary. Prime bare wood areas before repainting. Use of a top quality primer and top coat should prevent a recurrence of the problem.