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 What
are inspection rings and how are they made?
>These are plastic reinforcement rings that are
glued in places where you may later need access. As an example, you
would want inspection access holes to inspect spars, in areas where
you will be attaching wings to struts, or any area that you will
need to access as you assemble the airplane. They are also located
wherever you will want to gain access for inspection purposes.
How
will I know where to place them?
>There is no set rule. If you are recovering an
airplane, note where the inspection holes were previously located.
You may want to place them in the same areas. Otherwise, use your
own judgment based on where you will need access.
Do
they go on top or bottom of a surface?
>Try to place all of them on the bottom side of
all surfaces. That will be more pleasing to the eye and will not
interfere with lift on the top surface of wings, etc.
Should
I cover the inspection rings with fabric?
>Definitely! Be sure to cover them with fabric
otherwise they will vibrate loose and separate with time. Cut a
piece of fabric in a circular form using a 1 gallon can as a
template. This will provide a piece that will overlap the edges of
the ring.
Should
I use straight scissors or pinking shears to cut the patch?
>Use pinking shears.
What
weight fabric do I use?
>Lightweight fabric will work best. It will lie
down without wrinkles much better than other weights.
How
do I attach the fabric patch to the ring?
>Use Poly-Brush to attach the fabric patch. Coat
the area over where the patch will be located and let it dry. Then
go back and apply another coat of Poly-Brush and lay the fabric in
place. Use your brush to work the Poly-Brush up through the fabric
just as you would a finishing tape.
I
did what you said but I now have pinked edges that are rising up.
What can I do about that?
>Once the Poly-Brush is dry, go over the edges
with your iron set at 225 F. That will heat smooth the edges and
remove any bubbles you may have in the fabric.
I
don't understand. How will I get into the area if I am going to
cover it with fabric?
>After you have completely covered the airplane and sprayed the
last color coat, you can then use a pencil soldering iron and melt
the fabric around the ring. That will remove all of the fabric
inside the ring. You then place a metal inspection plate in the
hole.
Should
I open up all of the inspection holes when I have covered the
airplane?
>Not necessarily. You do not have to open all of
the holes until you are ready to use them. As a matter of fact, you
will not open all of them immediately.
How
will I get the color of the inspection plates to match the color of
the fabric?
>During the final color coats on the fabric, spray
all of the inspection plates you will need for the entire airplane.
Actually, you should paint a few extra. Painting them now will
ensure a proper match.
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