MIL-PRF-87978A
Coating System
Dry Film Thickness
Drying Time
Epoxy Primer, one coat
0.5 - 0.8 mils
1 hour
(MIL-P-23377)
Urethane Topcoat, two coats
0.8 - 1.1 mils each
4 hours between coats,
(MIL-C-85285)
48 hours after last coat
After the coating system has been applied to both sides of each panel and cured as above, all
panels shall be baked for 96 hours at 210 ±10°F (99 ±6°C), cooled to ambient temperature and
stored in a desiccator (or equivalent) until used for test.
4.5.4.2 Paint removal procedure (Type I). Two test panels of each metal specified in Table III,
and painted as required by 4.5.4.1, shall be immersed in a container of the paint remover
maintained at 55 ±5°F (13 ±3°C) for a period of two hours. At the conclusion of the test period
the test panels shall be rinsed with a water spray (hot or cold) not exceeding 100 psi. The test
panels shall be air dried and examined for compliance with the requirements of 3.7. (Visual
assessment)
TABLE III
METAL
SPECIFICATION
SURFACE TREATMENT
Aluminum (2024-T3)
ASTM B209
MIL-A-8625, Type II, Class 1,
Dichromate Seal
Magnesium
SAE AMS 4377(AZ31B-H24)
MIL-M-3171, Type III
Steel
SAE AMS 5046
MIL-STD-870, Type II, Cl 1
NOTE: All panels shall be sheared or cut prior to surface treatment. All panels shall be cleaned
and degreased with a suitable solvent prior to surface treatment and painting.
4.5.4.3 Paint removal procedure (Type II). Two test panels of each material specified in Table
III, and painted as required by 4.5.4.1 shall be immersed in a container of paint remover A
maintained at 55 ±5°F (13 ±3°C) for a period of one hour. Remove the two panels and rinse with
tap water (manufacturer's option). Immerse in a container of paint remover B maintained at 55
±5°F (13 ±3°C) for a period of one hour. At the conclusion of the test period the test panels shall
be rinsed with a water spray (hot or cold) not exceeding 100 psi. The test panels shall be air dried
and examined for compliance with 3.7. (Visual assessment)
4.5.5 Hydrogen embrittlement. Test specimens shall be prepared and tested in accordance with
ASTM F519, Type 1a, for maintenance chemicals. Accept or reject criteria shall be accordance
with ASTM F519, paragraph 9.
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