
Neutrals are tones and shades
that have little or no color, in the strictest sense.
Includes white, off-white, black, gray, taupe and very
light tans and browns.

Q&A
Q: From time to time
we have to do staining. With both interior and exterior
staining, we sometimes have
problems with unevenness like splotchiness, lapping,
and spots. What tips do you have to get a uniform appearance?
A: For exterior work, uniformity of color can be a challenge,
especially for brushed-on semi-trans stains.
For a given job, take care to do an area at a time
that is not too large. Doing too large an area can
result in lapping because the first application may
dry too much, so it is not re-dispersed when you
return for the lap. In deciding how large an area
to do, be
conscious of factors that impact drying rate, including
porosity and condition of the wood, humidity, temperature
and air movement. Avoid staining in bright, direct
sunshine. Sand burnished, shiny or mill-glazed wood.
For interior work,
take the following into account:
- Stains
can vary in penetration in that porous areas,
especially end grain, can stain darker than denser
nearby areas; gel stains tend to color more
evenly
than
liquid stains; water-based stains benefit from application first of a
pre-stain conditioner.
- Light spots that are permanent
can result from drips of moisture that get
on the surface while staining, even if they are wiped off immediately.
Wear an
absorptive sweat band while doing work in hot weather, and watch out
for drips from cold
beverage cans. Also, trying to do touch-up before the initial application
has dried can result in a light area even though more stain is being
applied. The
solvent in the re-applied stain extracts pigment from the wood… so,
for touch-up, allow the stain to dry overnight.
- How smooth and sealed,
or how porous the wood is, determines in part, how much stain is
absorbed and thus how dark the effect is. For a
given
piece
of wood,
steel-wooling the surface will reduce absorption, and a light sanding
will increase it. And significant differences can result, depending
whether you
use 400, 220
or 120 grit sandpaper. Coarser, lower-number grits will provide more
stain absorption. In any case, be sure to do the surface the same
way throughout.
Always sand in
the direction of the wood grain.

The Rohm and Haas Paint Quality Institute
P.O. Box 1348
Philadelphia, PA 19109
215.592.3000
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