Technical data

proportions of 15 to one by weight. Always properly mix in
the correct proportions by the manufacturer’s directions for
optimum results.
NOTE
The base compound has a tendency to settle out
in storage and should be thoroughly mixed prior
to adding the accelerator.
a. Shake the base compound on a standard paint shaker for
five minutes.
b. Mix the accelerator by stirring with a paddle and add to
the base compound.
c. Replace the base compound container lid and shake for
two to three minutes in an upright position followed by
two to three minutes in an inverted position.
NOTE
Fast and longer mixing decreases application
time (pot life). High humidity (70% R.H. or
above) at time of mixing decreases application
time (pot life).
6.12.5.4 Thinning. As supplied, this material is too
viscous to be easily sprayed and must be thinned prior to
application. Thinning of the material shall be accomplished
immediately after mixing of the two components. Transfer
the mixed material to a pressure pot, thin 50% by volume
with a ASTM D740 MEK and A-A-59107 Toluene blend, and
mix in the pressure pot for 2 minutes at 70 RPM. Use the
MEK/Toluene blend specified below for the following mixing
and application temperatures. After thinning, the viscosity of
the material shall be 8 to 22 seconds in a No. 4 Ford Cup
(17-29 seconds in a No. 2 Zahn Cup).
75° F - 50% (by volume) MEK and 50% (by volume)
Toluene.
85° F - 25% (by volume) MEK and 75% (by volume)
Toluene.
65° F - 75% (by volume) MEK and 25% (by volume)
Toluene.
6.12.5.5 Application. The primer can be applied by
HVLP, airless spray, or air assisted airless spray. The primer
has a 2-hour pot life at 75° F temperature and 50% relative
humidity. For every 18° F rise in temperature, the application
time (pot-life) is reduced by half; and for every 18° F drop in
temperature, the application time is doubled. The polysulfide
primer shall be applied to a wet film thickness of 3.0 to 4.0
mils which results in a dry thickness of 1.0 to 1.2 mils. The
polyurethane topcoat, MIL-PRF-85285, Type I can be applied
anytime after the polysulfide primer is tack free up to 24
hours if no moisture or dirt is on the aircraft, the aircraft is
kept in an environmentally controlled hangar, and no main-
tenance or walking has been done on the aircraft.
6.12.5.6 Drying Time. At 75° F, the tack free time is
approximately 6 hours, 3 hours at 90° F, and 12 hours at 60°
F; however, high humidity at time of application will shorten
the tack free time.
NOTE
• The material shall be applied to test panels as
specified in Paragraph 5.5.5, so that any de-
fects can be corrected prior to production
spray application. The correct line and pot
pressure can be determined at this time.
• Some orange peel appearance in the coating
system is inherent with this primer and is
acceptable.
• It is mandatory that spray equipment be
cleaned immediately after use.
6.12.6 Tiecoat, Non-Chromated. This coating differs
from MIL-PRF-23377 which has requirements directed to-
ward the corrosion protection of and adhesion to bare metal.
The tiecoat purchase description requirements are only for
adhesion to other coatings. Tiecoats listed here meet all of the
requirements for MIL-PRF-23377 Type I, Class N, except for
the corrosion protection requirements and are an interim
authorization until completion of the purchase description.
All test results and certifications for meeting the MIL-PRF-
23377 Type I, Class N, with the exception of the corrosion
protection requirements must be submitted to AFRL/MLS-
OLR for inclusion in this technical order. The following
coatings are approved as tiecoats for overcoating existing
MIL-PRF-85285 paint systems:
8010-01-482-8620 Aeroglaze 9741 (light gray) U/I GL
8010-01-483-4363 Aeroglaze 9743 (red) U/I GL
8010-01-483-4365 Aeroglaze 9744 (dark gray) I/I GL
6.12.6.1 Characteristics. This is a two-component,
VOC, solvent-borne, lead and chromate free epoxy coating
particularly formulated for its adhesion properties to other
coatings. It is compliant with the NESHAP VOC require-
ments of 340 g/l (2.8 lbs/gal). It is very resistant to chemicals
TO 1-1-8
6-10 Change 3