Piper CHEROKEE WARRIOR PA-28-151 1995 Maintenance Manual page 136

PIPER CHEROKEE WARRIOR SERVICE MANUAL
p. Cover with cellophane and squeegee smooth. Cure completely before removing cellophane. Sand
the area.
q. Brush or spray catalyzed resin to seal patch. Sand and finish by priming. Sand again and apply
color coat.
Clean brush and hands in solvent such as acetone. Use a
strong solution of detergent and water if solvents are not
a v a i lable.
4-57d. ADDING LAYERS TO UNDAMAGED AREAS.
a. Rough sand area to be laminated with 80 grit dry sandpaper.
b. Thoroughly clean area to be laminated with acetone, MEK, or equivalent.
c. Mix resin and catalysts according to the manufacturers instructions. Mix only enough to be used
one step at a time.
d. Thoroughly wet fiberglass cloth with catalyzed resin. Lay cloth on part and squeegee from center
to edges of cloth to remove all air bubbles, and to assure adhesion. Air bubbles will show white and all should
be worked out to the edge. Remove excess resin before it gels on the part.
e. Repeat step d until the desired number of cloth layers have been added.
f. Allow parts to cure for 24 hours at room temperature.
g. After part has cured it may be sanded and painted as required.
4-58. GENERAL THERMOPLASTIC REPAIRS
Common safety precautions must be followed when using the
materials and tools for these repairs.
Thermoplastic material is used throughout the airplane except for wheel and strut fairings. Check the
following list of materials and vendors to aid in thermoplastic repairs.`
a. Surface preparation:
1. Remove surface dirt and paint from item being repaired. Household cleaners are effective in
removing surface dirt.
2. Cleaning damaged area with perchlorethylene or VM&P Naptha will give a good bond
between epoxy compounds and thermoplastic.
b. Surface scratches, Abrasions or Ground-in-Dirt: (Refer to Figure 4-14.)
1. Shallow scratches and abraded surfaces are repaired using conventional automotive buff i n g
and rubbing compounds
When using a hot air gun, be careful not to overheat the
t h e rm oplastic.
2. Remove large dirt particles embedded in thermoplastic parts with a hot air gun capable of
heating to 300° to 400° F. Hold nozzle of gun about 1/4 inch away from surface and apply heat with a circular
motion until area is sufficiently soft to remove dirt particles.
3. Thermoplastic will return to its original shape upon cooling.
Revised: February 28, 1995
NOTE
WARNING
—CAUTION—
1F16
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