TM-1-1500-344-23-2
AIRCRAFT VOLUME II
TECHNICAL MANUAL; CLEANING AND CORROSION CONTROL
APRIL 2009
TM-1-1500-344-23-2 - Page 190 of 240
A-20
NAVAIR 01-1A-509-2
TM 1-1500-344-23-2
15 April 2009
NOTE
PreVal sprayers are not authorized for painting
large areas. These sprayers are intended only
for small, spot repairs.
A-9.3. PREVAL AEROSOL TOUCH-UP PAINT
SYSTEMS. PreVal sprayers provide a simple method
of applying approved coatings for small, touch-up
processes. These sprayers minimize many of the
problems associated with hazardous waste disposal,
equipment cleanup, and related safety hazards. Many
of the commonly used primers and topcoats
(MIL-PRF-23377, MIL-PRF-85582, MIL-PRF-85285
Type I, and MIL-PRF-81352 Type III) are available in
small 2 ounce bottles that attach directly to the PreVal
sprayer. Refer to Volume IV for ordering information.
NOTE
Primers and topcoats in 2 ounce bottles may
also be applied by brush for small, touch-up
applications.
A-9.3.1. PreVal Aerosol Touch-Up Primers. Both
MIL-PRF-23377 and MIL-PRF-85582 Epoxy Primers
are available in small 2 ounce kits that can attach
directly to PreVal sprayers. These kits are supplied as
two part materials (catalyst and base components) that
must be mixed prior to use. Follow manufacturer’s
instructions printed on the container label for proper
mixing procedures. See paragraph A-9.3.3 for additional
mixing and application instructions.
A-9.3.2. PreVal Aerosol Touch-Up Topcoats. Both
MIL-PRF-85285 Type I polyurethane coating and
MIL-PRF-81352 Type III one component aircraft
touch-up coating are available in small 2 ounce kits that
can attach directly to PreVal sprayers.
a. MIL-PRF-85285 Type I topcoat kits are supplied
as two part materials (catalyst and base components)
that must be mixed prior to use. Follow manufacturer’s
instructions printed on the container label for proper
mixing procedures. See paragraph A-9.3.3 for additional
mixing and application instructions.
b. MIL-PRF-81352 Type III is supplied as a single
component topcoat that is ready to use. See paragraph
A-9.3.4 for additional mixing and application instructions.
WARNING
The PreVal sprayer has an air vent on the
coupling. To avoid leakage and personal injury,
never shake the sprayer once it has been
attached to the bottle. Eye protection and proper
protective equipment are required when
handling, mixing and applying coatings using
PreVal sprayers.
NOTE
To prevent leaking, do not tilt PreVal sprayers
beyond a 45 degree angle. Spray angles of
45 degrees or less will ensure the proper
discharge of coatings. During any continuous
spray application, PreVal sprayers may "freeze
up" and cause irregular spray patterns. To
avoid freezing up, limit each spray application
to a pattern of 36 square inches (6" X 6"), then
pause and continue with spraying. Repeat as
necessary until repair area is properly coated.
A-9.3.3. Two Component Primer and Topcoat Mixing
and Application Instructions.
a. Two component primers and topcoats must be
mixed carefully prior to use. Follow manufacturer’s
instructions printed on the container label for proper
mixing procedures for base and catalyst components.
Some vendors supply two separate bottles for the two
components, others supply the catalyst in a small internal
bottle (as a bottle within a bottle) under the cap. Mix
entire contents of each kit.
b. Replace cap on larger bottle and shake mixture
thoroughly for two minutes. After shaking, allow coating
to rest for two minutes to dissipate any air bubbles.
c. Attach pick-up tube to the PreVal sprayer.
d.
Remove cap from coating bottle and attach
bottle to the PreVal sprayer. To prevent leakage, do not
shake the bottle once it is attached to the PreVal
sprayer.
e. After proper surface preparation (refer to
paragraph A-7), apply coating in a manner similar to
conventional spray gun painting processes, making full
sweeps and stopping the spray at the end of each
sweep.
f.
Clean PreVal sprayer after each use. Refer to
paragraph A-9.3.5 for cleaning procedures.
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