Technical data

b. Apply and agitate first coat of PreKote SP in small
sections (approximately 16 square feet per person work-
ing an area).
NOTE
Do not allow PreKote SP to dry prior to rinse.
c. Rinse area with water.
d. Repeat Paragraph 3.1.21 step a and Paragraph 3.1.21 b
until entire area to be painted has been covered.
e. Apply the second coat of PreKote SP with pressure
sprayer or spray bottle. Area of application should not be
so large as to allow the PreKote SP to dry prior to
scrubbing.
f. Scrub with 180-grit scrub pads on sanding poles until a
rich lather is formed.
g. Let the second coat of PreKote SP static air dry on the
aircraft surface.
h. Spray the third coat of PreKote SP with a pressure
sprayer or spray bottle. Area of application should not be
so large as to allow the PreKote SP to dry prior to
scrubbing.
i. Scrub aircraft with sanding poles and 180-grit scrub
pads.
It is important that the entire third coat be
completely removed. Coating failure may result
if this application of PreKote SP is not com-
pletely removed.
j. Thoroughly rinse the surface of the aircraft with deion-
ized water. Rinsing shall immediately follow scrubbing.
Scrubbed areas shall not be allowed to dry prior to use.
k. Remove all masking.
NOTE
Deionized water is preferred for this final wipe/
rinse but not mandatory.
l. Thoroughly rinse aircraft for second time.
Maximum time allowed prior to repaint is 48
hours. Excess time prior to paint application will
cause degradation of surface condition. To avoid
damage to the PreKote SP and surface of the
aircraft, all personnel shall wear cotton booties
when on aircraft from this point forward.
m. Let the surface of the aircraft static air dry.
3.1.22 Use of PreKote SP on Exterior Surfaces
Where Paint and Primer Have Been Removed During
Scuff Sand, Touch-up or Repair. PreKote SP may be
used on exterior aluminum parts as an alternative surface
preparation for MIL-DTL-5541 chemical conversion coating,
and corrosion removal treatment requirements (MIL-M-3171,
SAE-AMS-M-3171, MIL-C-38334/SAE AMS-1640 prior to
prime and paint.
a. Prepare exterior surfaces per Paragraph 3.1.21.
Finish system removal using motor driven abra-
sives may generate airborne particles and toxic
dust, which may injure personnel and create a
possible dust explosion. All aerospace and mo-
torized ground equipment shall be properly elec-
trically grounded. Personnel shall wear dust par-
ticle masks, goggles, gloves and long sleeved
shirts when using motor driven abrasives. Con-
sult Bioenvironmental Engineering Services for
respiratory and ventilation requirements.
Avoid excessive pressure or repeated passing
over the same area while sanding. Excess sanding
can cause damage to the surface of the aircraft.
NOTE
Some residual amounts of old coating system
may be left after stripping (i.e., fastener heads,
seams, hinges, surface porosity, etc.). These areas
are acceptable as long as they are feathered into
the surrounding surface.
b. If area to be prepared is adjacent to old paint system,
lightly sand entire bare metal area and feather edges
where required using 240-grit sandpaper.
c. Solvent wipe sanded area with denatured alcohol (O-E-
760/MIL-A-6090, Type III) or isopropyl alcohol (17-1-
735).
d. Mask area where PreKote SP is to be applied so as to
avoid contact with surrounding paint. Masking should
extend to the outside edges of the feathered area or to
the edge of the part being treated.
TO 1-1-8
3-14 Change 3