TM55-1500-345-23
Use with adequate ventilation.
bubbles or other film irregularities. Class B coat-
Avoid prolonged breathing of vapors.
ings shall be fully cured within 10 days and shall
. Avoid prolonged
repeated contact
be free of pinholes, cracks, bubbles, or other film
with skin.
irregularities.
Failure to observe these precautions can result in
b. Application of Coating System. Military
serious injury or systemic poisoning of personnel.
Specification MIL-C-83445.
Sand damaged surface to a feather edge. Extend
(1) Mixing. Components of class 1 and 2
sanded surface beyond damaged ores approximately 1
coatings shall be individually mixed in accord-
inch. Clean sanded surface with a clean, lint-free cloth
ance with the manufacturer's instructions. The
dampened with methylethylketone, Federal Specifica-
resulting individual mixtures shall be smooth.
tion TT-M-261 . Immediately wipe with a second dry,
homogeneous materials free from lumps, gelling.
clean, lint-free cloth to remove residue and allow to dry
seeding, separation or other objectionable char-
thoroughly. Apply primer and coating(s) as previously
acteristics.
directed herein. Exercise extreme caution to prevent
uneven and excessive buildup of coating when making
(2) Pot Life. Class 1 and 2 base coating
repairs to radome coatings. Excessive coating thickness
and topcoating solutions shall have a minimum
will reduce radome electrical transmission efficiency
pot life of 4 hours after catalyzation. At the end of
and in the case of doppler and fire control radomes,
could result in beam deflection errors beyond tolerable
the 4 hour period. the coatings shall show no
limits.
s i g n s o f l u m p i n g , seeding. separation or an
increase in viscosity of more than 20 percent from
the initial viscosity when tested in accordance
6-35. REMOVAL OF COATINGS.
with 4.7.9 and Table 1.
(3) The coatings shall be applied in
METHYL ETHYL KETONE
accordance with the manufacturer's instructions
to a total dry film thickness of 12 to 14 mils. The
Keep away from heat and open flame.
total application time, including intervals between
Keep container closed.
coatings shall not exceed 8 hours and the tack
Use with adequate ventilation.
free drying time shall not exceed 10 hours after
Avoid prolonged breathing of vapors,
final application of the coatings.
Avoid prolonged or repeated contact
with skin.
(4) The rate-of-cure of the coatings shall
have a maximum set-to-touch or recoat time of
Failure to observe these precautions can result in
one hour. The manufacturer shall furnish instruc-
serious injury or systemic poisoning of personnel.
tions for catalyzing or accelerating the polyure-
thane base materials for a temperature range from
a. Prior to application of neoprene, inspect
65 to 95F (18 to 35C) and a relative humidity
radomes for damages that penetrate face plies.
range from 40 to 75 percent.
To prevent the solvent from entering the radome
core, cover damages that penetrate face plies
(5) Class 1 and 2 coatings shall be fully
with tape. Federal Specification PPP-T-60. Extend
cured within 5 days and shall be free of pinholes,
tape approximately 3 inches beyond edges of
cracks, bubbles or other film irregularities.
damaged area. Do not attempt to remove coating
under the tape. This coating will be removed
either with face ply when damaged area is
6-34. PATCHING OR RETOUCHING
repaired, or by hand sanding.
DAMAGED COATINGS.
b. Removal of erosion resistant coatings shall
be accomplished by one of the following meth-
METHYL ETHYL KETONE
ods:
Keep away from heat and open flame.
Keep container closed.
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