Steve Kroop at Flytec <<info>>
writes:

Flytec instruments have a clear acrylic window in front of the
LCD. This window is there to protect the LCD from impact and scratches and to
keep dirt and fluids from getting inside the housing. Bad landings and general
rough handling typical of HG/PG will scuff and scratch this acrylic and
eventually may interfere with the readability of the display. The following
instructions are how to remove these scuffs and scratches.

To avoid wasting time you will first want determine the nature of the blemish so
you can use the least aggressive technique possible. Run a fingernail across the
blemish, if you can feel the defect with your fingernail you will need to start
with an abrasive. The more you can feel the defect the coarser the abrasive you
will need. If you do not "feel" the scratch then you likely can go right to
polishing. Novus plastic Polish is ideal for these minor scratches. Novus 3 is
for slightly heaver scratches and Novus 2 is for very fine scratches/abrasions.
From a practical stand point Novus 3 will yield a more than adequate finish.

Household paper towel is excellent for polishing since it is slightly abrasive
itself. Cut a paper towel into small pieces (~3"x3"). Take one and fold into a
small pad and apply 1-2 drops of polish to the pad. Rub the scratched area with
small overlapping circles. It is important to note that the window is bonded to
the front housing with adhesive. With instrument use and time, this adhesive may
have weakened so only apply minimal pressure while polishing to avoid dislodging
the window. Continue the circles until the polish starts to dry out. Take a
fresh square and wipe the window clean and inspect. If the scratch is still
there, apply another 1-2 drops of polish and continue polishing as above.
Inspect again and repeat this process as necessary (put on some music or a movie
and take your time). Once the scratch(s) is removed to your satisfaction, apply
1-2 drops to a fresh square and now make bigger circles over the entire window
to even-out the surface of the window.

For deeper scratches (the ones you can feel) you will need to use a micro-mesh
abrasive before polishing. Micro-mesh sanding sticks are available with 4 grits
on one small flexible stick (usually medium, fine, super fine and ultra fine).
Always use the finest grit that will get the job done. Ultra fine is just a
little more aggressive than Novus 3 polish so I recommend that you start with
super fine. Make small overlapping circles over the scratch for a minute or two,
wipe clean with a fresh square and inspect. If the scratch has not appreciably
improved, go to the next coarser grit and start over. Once the scratch(s) is
removed, lightly go over the entire window with that grit before proceeding to
the next finer grit. Repeat these steps ending with ultra fine. You can then
proceed with polishing steps above. Important: Do not use conventional
sandpaper. Conventional sandpaper is not critically graded, this means that it
will be very time consuming to get the sanding marks out each time you progress
to a finer grit. You can get Micro-mesh sanding sticks online or you can get a
4-grit combination stick from us by sending $4 and a SASE to: Flytec USA, 442
Nautilus Dr., Satellite Beach, FL 32937.