Defects in Paintworks
The
common defects that should be avoided in the painting are as follows:
Alligatoring:
This means cracked like the skin of an alligator. It happens when we apply a second coat before the first coat has completely dried.
Blistering: These
are formed by water vapor trapped inside non-breathing types of paints.
Bloom
or flashing: These involve the formation of dull patches
usually due to a defect in paint or bad ventilation.
Brush
marks: These occur due to defective work.
Cracking: It
occurs due to defects of paint and fast drying.
Flaking: It
occurs due to poor adhesion of paint to the surface.
Lack
of opacity or body: It happens due to the over-thinning of paint or
inadequate stirring of paint during its application.
Peeling: It
occurs when a painting is done over a greasy or dirty surface or when moisture is
trapped beneath the paint.
Pin
holes: These are formed when there are small holes present in
the surfaces such as in walls even before painting. The air from these holes
can burst forth and create holes. Hence, the surface should be leveled with putty
before painting.
Slow
drying: It can occur due to a moist unhardened undercoat, bad
quality of paint, or painting in damp weather or on a greasy surface.
When
these defects occur remove the paint from the place where it has occurred by a
scraper or putty knife, sand the surface smoothly, paint with primer and repaint
properly with the paint.
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