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 IMPORTANT
TOPICS
TRIMEX WM IS A TOOL –
PRACTICE FIRST
Any new
tool that you use requires practice to master it.
Remember
when you used a spray gun the first time.
The use of the liquid mask in a spray gun will require practice to
reach the proper thickness (5-6 MILS wet).
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DON’Ts
Do not use additives.
Do
not use on stained
glass, frosted
glass, etched
glass, textured
glass, tinted
glass, any coated
glass, plastic glass or Plexiglas™.
Do not topcoat or cover with lacquers, primers or paints containing ketones or alchols.
Do not topcoat with alkyd
or oil base paint unless thoroughly dry.
DOs
Do
ask
about the glass to make sure that it is plain glass with no coating.
Do
test
the glass
if not sure.
Do check
the glass for prior cuts or scraps so that you can point out these problem
areas before you start the job.
Note on your contract where the damaged windows are and have the owner
initial the contract at the portion of the contract dealing with the damage
(cuts, scraps).
Do prime
steel frames before coating with the liquid mask.
DRYING AND CURING
Leaving the liquid mask long
enough to fully dry and cure is extremely important. It is best to let the liquid mask dry over night before topcoating with paint. Put the mask on early
in the job and do other parts of the job while the liquid mask dries.
If the mask is not fully dry
when it is topcoated with paint, the moisture and other volatiles in the liquid
mask may cause the topcoat or paint to crack.
This is especially true for alkyd or oil based paints used as the
topcoat. If the
humidity is high, the liquid mask will take longer to dry and cure.
For example, if you are painting indoors and the wallboard seams have
just been spackled, the humidity will remain high for over a day, and the liquid
mask should be allowed to dry for over a day.
ALLIGATORING – CRACKING OF THE TOP COATING
Alligatoring can be a problem if the liquid mask
is topcoated before it dries. It is
very important to follow the instructions on the container to avoid this
problem. Alligatoring is caused by painting
over the liquid mask before it is completely dry and cured.
Let the liquid mask dry overnight when
possible. If the humidity is high,
such as before or after a rain or in the morning, let the liquid mask dry for
several hours. Error on the side of
waiting too long.
ALKYD OR OIL BASE PAINTS
The liquid mask can be applied over an alkyd or oil based paint after normal preparation of the oil
based paint surface for painting, such as sanding of rough spots, removal of
dirt, etc..
An oil-based paint can be used
to topcoat the liquid mask, but the mask must be completely
dry before topcoating the liquid mask.
The same is true for latex paints. You
should test first under the
conditions that will be experienced at the job.
SPRAYING EQUIPTMENT:
The liquid mask can be sprayed
using a conventional, an airless or a HVLP sprayer.
Below are some suggestions that may be of help.
However, testing / practicing is always recommended to make sure that you
have the correct set-up.
A conventional
sprayer should use the set-up recommended for a thick latex paint.
An airless
sprayer should be operated at approximately 2,500 psi with a 411-513 tip.
A HVLP
sprayer should use the set-up recommended for a thick latex paint.
Pressurize the cup or pot if possible.
TECHNIQUE
Spray on a light coat using a
horizontal path across some of the panes and then spray the panes using a
vertical path.
If running or sagging occurs,
immediately smooth out the area with a brush.
REMOVAL OF THE MASK FROM THE GLASS
The mask should be cut
very carefully. Glass is more
tender than you think and can be easily cut or scraped.
Low humidity, hot and dry
conditions or sunny days can cause the mask to be difficult to remove. The
removal can be helped by wetting the mask
with water on a sponge or cloth. However,
the easiest method is to remove the mask
in the morning before the sun dries out the mask on the glass.
If the mask does not peel off
in one piece, the mask is too thin. A
second coat of mask should be sprayed over the first coat to increase its
thickness and strength.
The
more humid that the climate is; the thinner the mask can be.
Practice will show you what thickness is needed.
Usually, a thickness of 4-5 MILS when wet will do.
