MIL-PRF-26915D
3.4.7 Lifting properties. The topcoating films applied to the primer shall produce no lifting or
other film imperfections (see 4.8.6).
3.4.8 Adhesion (wet tape). A coating of the primer, the primer plus enamel, and the primer plus
high solids polyurethane topcoat shall show no blistering, softening, or loss of adhesion between
topcoats and primer or between primer and substrate (see 4.8.7).
3.4.9 Adhesion to weathered finishes. The primer shall adhere to aged finishes. The coatings
shall dry tight to the aged finish and shall show no evidence of lifting or peeling (see 4.8.8).
3.5 Environmental conditions.
3.5.1 Hazardous materials. The primer shall not contain chlorinated solvents or hydrolyzable
chlorine derivatives. Also, the primer shall not contain or require for application any EPA Class I
Ozone Depleting Substances/Chemicals or hazardous materials as defined in FED-STD-313. Nor
shall the primer contain any chemical listed in the current report of known carcinogens of National
Toxicology Program (see 4.9.1).
3.5.2 Odor. The primer shall not have an obnoxious odor (see 4.9.2).
3.5.3 Water resistance. The primer shall be water resistant. When immersed in water, the primer
shall show no signs of wrinkling, blistering, loss of adhesion, or other visible defects or blemishes
(see 4.9.3).
3.5.4 Hydrocarbon resistance. The primer shall be hydrocarbon resistant. When immersed in
hydrocarbon fluid for 24 hours, the primer shall show no signs of wrinkling, blistering, loss of
adhesion, or other visible defects (see 4.9.4).
3.5.5 Synthetic fluid resistance. The primer shall be synthetic fluid resistant. When immersed in
synthetic fluid for 168 hours, the primer shall show no signs of wrinkling, blistering, loss of
adhesion, or other visible defects(see 4.9.5).
3.5.6 Humidity resistance. The primer shall be humidity resistant with a coating of primer and
primer plus topcoats. When tested IAW 4.9.6, the primer shall show no signs of wrinkling,
blistering, loss of adhesion, or other visible defects(see 4.9.6).
3.5.7 Salt spray resistance. The primer plus topcoats shall show no blistering, wrinkling or loss
of adhesion. There shall be no rusting or other visual evidence of panel corrosion (see 4.9.7).
3.5.8 Heat resistance. The primer shall not be adversely affected by heat (see 4.9.8).
3.5.9 Inhibitive properties. A primer coated panel shall inhibit the spread of corrosion beyond a
maximum of 1/8 inch from the score line (see 4.9.9).
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