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What
is the purpose of Poly-Brush?
>You must seal the weave of the fabric before
flight. Otherwise, lift will not be created. Poly-Brush accomplishes
this along with providing a base chemical coat attached to the
fabric. Poly-Brush actually encapsulates the fabric providing a bond
to the fabric. Subsequent chemical coats will then adhere to this
first coat. Poly-Brush serves a secondary function of securing
fabric to the underlying structure. This is particularly important
on a plywood surface.
Should
I always brush on the first coat of Poly-Brush?
>If you do not have any previous covering experience we recommend
that you brush on the first coat. It can be sprayed on but you must
have enough experience to know when the fabric is properly sealed.
What
type brush should I use?
>We recommend at least a 2 inch wide brush that is a high quality
polyester or natural bristle.
Why
is Poly-Brush a tinted color?
>So that you can see it as it is applied.
Do
you make Poly-Brush without the tinted color?
>Yes, Poly-Brush is available untinted. This is for use on a
fuselage of an open cockpit airplane where you do not want a color
on the backside of the fabric.
How
do I know how much Poly-Brush to order?
>The Poly-Fiber manual has estimates for most aircraft. 1 gallon
will cover about 150 square feet for one coat.
Should
I be careful where I store Poly-Brush?
>It is flammable so be sure to store it in a safe place. Also, do
not store it where the temperature will exceed 100 degrees F for a
long period of time. It is not affected by freezing.
I
have some Poly-Brush that I purchased 4 years ago. Is it still good?
>The shelf life of Poly-Brush is at least 4 years.
Should
I thin Poly-Brush before applying it? If so, what kind of thinner
should I use?
>Yes, Poly-Brush should be thinned 1 part of thinner to 3 parts
of Poly-Brush. If the temperature is less than 85 degrees F use R
65-75 Reducer. If the temperature is 85 degrees F or above use R8500
reducer.
What
should the temperature be before I brush on the Poly-Brush?
>Do not apply Poly-Brush in temperatures below 60 degrees F.
Is
it really necessary to clean the fabric before I apply the first
coat of Poly-Brush?
>Absolutely! You must clean the fabric using a clean cotton rag
and MEK. Wipe it down thoroughly. This will remove all oil, dirt,
and other contaminants that will prevent Poly-Brush from adhering to
the fabric.
While
brushing on Poly-Brush, I notice runs appearing on the underneath
side of the fabric. Is that a problem?
>It is normal for Poly-Brush to run under the fabric. As a matter
of fact, it should if you are getting good penetration. However, you
do not want it to drip through to the fabric beneath unless that
fabric has already had a coat of Poly-Brush applied. In other words,
if you are applying Poly-Brush to the topside of a wing and the
bottom side has not been coated, do not allow the Poly-Brush to drip
through to the bottom side.
What
if I accidentally allow Poly-Brush to drip through onto the unsealed
surface?
>Immediately take MEK on a clean rag and remove the Poly-Brush
from that area.
How
long does it take for Poly-Brush to dry?
>This depends upon the temperature. Usually it will dry in about
15 minutes.
What about brush
marks?
>Brush marks are usually not a problem on the first coat. Don't
continue to go back over areas with more Poly-Brush. That can cause
a problem. Simply brush on a wet coat using one pass with the brush.
Go back over the area one time only to smooth bubbles that might
have formed.
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