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.