MIL-DTL-53039E
for pigment settling as specified in 4.6.14. Determine viscosity and other applicable tests for
compliance with 3.6.2.2.
4.6.16 Spraying properties. If reduction is necessary for spray application, reduce with a VOHAP-
free thinner recommended by the manufacturer, not to exceed VOC limits where applicable. Spray
the coating on a solvent cleaned test panel (see 4.6.1.2 and 4.6.1.3) to a dry film thickness between
2 ± 0.2 mils (50 ± 5 microns). Observe the spraying properties for compliance with 3.6.3.
4.6.17 Brushing properties. Apply the coating using a 2-1/2 inch brush to a test panel pretreated
and primed (see 4.6.1.2 and 4.6.1.3). The packaged coating shall be reduced as in 4.6.16 without
exceeding the VOC limit if needed. Check for compliance with 3.6.4.
4.6.18 Flexibility. Determine flexibility in accordance with ASTM D522, method B using a ¼
inch mandrel. Spray the coating on a steel panel, tinplated 0.010 inches (0.254 mm) thick. Air
dry for 168 hours. Bend the coated panels according to ASTM D522, method B. Examine the
coating for cracks over the area of the bend for compliance with 3.6.5.
4.6.19 Recoatability. Prepare two test panels pretreated (see 4.6.1.2) and primed (see 4.6.1.3).
Air dry the two test panels according to the requirements of the primer in use for this test. Mix
the coating by agitating the paint can for 5 minutes on a paint shaker. Spray the coating to a dry
film thickness of 2 ± 0.2 mils (50 ± 5 microns). Apply a second coat of paint to one of the above
panels after 2 hours (air dry) and a second coat to the other after air drying for 24 hours. Air dry
both panels 24 hours. Examine for lifting, softening, and evidence of other film irregularity for
compliance with 3.6.6.
4.6.20 Adhesion. Prepare a test panel pretreated (see 4.6.1.2) and primed (see 4.6.1.3). Mix the
coating as specified in 4.6.16. Spray the coating to a dry film thickness of 2 ± 0.2 mils (50 ± 5
microns) and air dry for 168 hours. Perform adhesion testing as specified in ASTM D3359,
method B, and examine for compliance with 3.6.7.
4.6.21 Elevated temperature adhesion. Prepare three test panels pretreated (see 4.6.1.2) and
primed (see 4.6.1.3). Mix the coating as specified in 4.6.19. On the test panels, spray the
coating to a dry film thickness of 2 ± 0.2 mils (50 ± 5 microns). The first panel is to be dried at
room temperature. The second panel is to be dried at room temperature for 30 minutes followed
by hour oven exposure at 180 °F. The third panel is to be dried at room temperature for 30
minutes followed by hour oven exposure at 240 °F. All three panels are to be recoated to a dry
film thickness of 2 ± 0.2 mils (50 ± 5 microns) within 24 hours after the initial topcoating. These
panels are to cure at room temperature after the recoat. Twenty four (24) hours after the recoat,
the panels are to be examined for lifting, softening and evidence of other film irregularity for
compliance with 3.6.8. After 168 hours of air drying, perform adhesion testing as specified in
ASTM D3359, method B, and examine for compliance with 3.6.8.
4.6.22 Water resistance. Prepare a test panel pretreated (see 4.6.1.2) and primed (see 4.6.1.3).
Mix the coating by agitating the paint can for 5 minutes on a paint shaker. Spray the coating to a
dry film thickness of 2 ± 0.2 mils (50 ± 5 microns) and air dry for 168 hours. Coat all exposed
unpainted metal surfaces with wax or suitable protective coating and immerse in deionized water at
25 ± 1 °C (77 ± 2 °F) for 168 hours. Panels shall be immersed at a minimum depth of 50%. At the
end of the test period, remove and examine for compliance with 3.6.9.
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