MIL-DTL-15090E
3.6.3 Flexibility. When tested as specified in 4.7.7, a film of the enamel shall show no evidence of cracking or
flaking.
3.6.4 VOC regulations. Thinning of this VOC compliant paint is not allowed. This paint is to be used as
supplied without thinning.
3.6.5 Condition in container. When tested as specified in 4.7.8, a freshly opened, full container of enamel shall
be free from lumps, abnormal thickening, or livering and shall show no more pigment settling or caking than can be
readily reincorporated to a smooth, uniform state.
3.6.5.1 Storage stability.
3.6.5.1.1 Full container. When tested as specified in 4.7.9.1, the product shall be capable of being readily
broken up with a paddle to a smooth uniform consistency. It shall be free from livering, curdling, gelling, pigment
float, hard caking, gummy sediment, or other objectionable properties for at least 1 year after date of manufacture.
The enamel shall conform in all respects to this specification.
3.6.5.1.2 Partially full container. When tested as specified in 4.7.9.2, enamel shall show no skinning at the end
of 48 hours. In addition, the enamel shall show no livering, curdling, hard caking, or gummy sediment after being in
a partially filled container at 26.67 °C (80 °F). The enamel shall mix readily to a smooth uniform state. Any skin
formed shall be easily removed.
3.6.6 Application properties.
3.6.6.1 Rolling properties. When tested as specified in table VI, the enamel shall roll satisfactorily and shall
dry to a uniform film, free from seed, runs, sags or streaks. The dried film shall show an even, smooth finish.
3.6.6.2 Brushing properties. When tested as specified in table VI, the enamel shall be capable of being brushed
out and laid off without excess drag on the brush. When dry, the brushed surface shall be free of sags and runs and
shall show a minimum of brush marks.
3.6.6.3 Spraying properties. When tested as specified in table VI, the enamel shall spray satisfactorily in all
respects and shall show no running, sagging, streaking, or orange peel. The film shall air dry and show no seeding,
dusting, floating, fogging, mottling, hazing, or other film defects.
3.6.7 Cross-cut adhesion test. When tested as specified in 4.7.11.1, 4.7.11.2, and table VI, a 0.025-mm
(nominal) [0.001-inch (nominal)] dry film of enamel shall achieve a minimum classification of 4B.
3.6.8 Water resistance . When tested as specified in 4.7.10, a film of enamel shall show no wrinkling or
blistering immediately after removal of the panel from water. The enamel shall be only slightly affected with regard
to adhesion when observed 2 hours after removal from the water. After 24 hours air drying, the portion of the panel
which was immersed shall be almost indistinguishable, with regard to adhesion (see 3.6.7) and general appearance
(see 3.6.10) from the portion of the panel that was not immersed.
3.6.9 Compatibility.
3.6.9.1 Compatibility with topcoats. When tested as specified in 4.7.11.1, the enamel shall show no signs of
incompatibility such as blistering, wrinkling or peeling when topcoated with coatings manufactured in accordance
with MIL-PRF-24635 and MIL-PRF-24763. Visually examine for incompatibility immediately after topcoat
application. After 48 hours, visually examine for compatibility and perform and meet 3.6.8 requirements.
3.6.9.2 Compatibility with primers and undercoats. When tested as specified in 4.7.11.2, the enamel shall show
no signs of incompatibility such as blistering, wrinkling or peeling when applied over fully cured or dried films of
coatings manufactured in accordance with TT-P-645 or MIL-DTL-24441, Type III and Type IV Formula 150
primer. Visually examine for incompatibility immediately after topcoat application. After 48 hours, visually
examine for compatibility and conformance to 3.6.7 requirements.
3.6.10 Surface appearance. When tested as specified in 4.7.12, a flow-out film on glass of the mixed enamel,
after drying for 24 hours, shall exhibit a surface smooth in appearance and free of defects, such as loss of dry, color
drift, seeding, pinholes, coarse particles, skins, or agglomerates of any kind.
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