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.
The Rohm
and Haas Paint Quality Institute gives access to the most
comprehensive and expert source of information and advice on all issues
surrounding paint, paint quality and decorative effects.
