Natural-bristle brushes should be used only when
applying alkyd or oil-based paints. If you use a
natural-bristle brush to apply a latex paint, the
bristles will absorb the water from the paint,
making the bristle limp and difficult to work with.
Synthetic-bristle brushes can be used to apply
latex paints, and some can also be used with alkyd
products.
Quality brushes share the following
characteristics:
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They have split or "flagged" ends and are flexible
at their tips which helps produce a finer finish.
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They are tapered such that the bristles in the
center are slightly longer than those at the edge
which helps lay the paint down smoothly and evenly.
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They typically are at least half-again as long as
they are wide. For example, the bristles on a 2"
wide brush should be at least 3" in length.
It is important to use quality brushes rather than
inexpensive brushes because they apply paint in a
thicker, smoother film which provides maximum
hiding and sheen uniformity. Inexpensive quality
brushes often leave ridges in the paint where dirt
can collect and mildew can grow.
Brushes serve different purposes. A 4" brush with
tightly packed bristles in a 3/4" to 1" thickness
is best for general exterior painting.
A 3" brush serves most general interior
painting purposes. A 2" brush can be used to cut-in
corners for interior work. An angled sash brush, 1"
to 2 1/2" wide, is ideal for painting both interior
and exterior trim, window frames and moldings.
Paint Rollers:
Many people prefer paint rollers rather than paint
brushes because they apply paint much more quickly.
When working with rollers, as with brushes, only
synthetic roller covers should be used to apply
latex paint. Better quality roller will:
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Retain their shape when squeezed.
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Have no obvious seams which can cause streaks in
the finished paint job.
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They have few loose fibers.
The nap on the roller depends on what you are
painting. For the smooth surfaces the shorter the
nap. For rough surfaces the longer the nap. Here
are some suggestions on what nap roller to use on
different material.
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On wallboard, smooth plaster, wood, or metal, use a
short nap of 1/8" to 1/4".
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On light-textured stucco, concrete, or rough wood,
use a medium nap of 3/8" to 1/2".
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On heavy-textured stucco, concrete block, or brick
use a long nap of 3/4" to 1".
Roller frames come in a variety of styles. U-shaped
frames are generally the best because they are
sturdier. When choosing frames, be sure to select
those that are sealed on the ends to help keep the
paint on the roller.
Paint Pads:
Painting pads are useful in applying paint in
difficult places such as corners and behind
radiators. Most paint pads are made of plastic foam
or other synthetic materials. They are suitable for
both latex and alkyd paints.