MIL-PRF-26915D
b. Panels for the flexibility tests shall be 0.022 ± 0.002 inch thick.
c. Other test panels shall be 0.03 to 0.06 inch thick.
4.6.2 Types of test panel surface preparation.
4.6.2.1 Solvent-cleaned panels. Test panels shall be washed until clean in a solvent and wiped
down with a lint-free cloth.
4.6.2.2 Phosphoric acid-cleaned panels. The panels shall be treated as follows:
a. Immerse for 2 hours in acid cleaner IAW TT-C-490, Method VI.
b. Panels shall then be rinsed in water and immersed for 15 minutes in a 3% aqueous
solution of potassium dichromate (pH 5.0 to 6.0) at 75° ± 2°F.
c. Force dry panels at 200° ± 12°F.
4.6.2.3 Sand blasted panels. Solvent-cleaned test panels shall be sand blasted using any suitable
equipment and blasting material. The blasting material shall be free from oil, grease, dirt, water,
and other materials that would impair the coatability of the panel surface. After blasting, the
panels shall be cleaned by using clean compressed air or vacuum.
4.6.2.4 Zinc phosphated panels. The test panels shall be selected from smooth steel free from
rust. Test panels shall be phosphated IAW with TT-C-490, Type I.
4.6.3 Coating of test panels.
4.6.3.1 Application of primer. After preparation of the test panels, they shall be kept clean and
free from fingerprints, rust, and other surface contamination. Application of at least one coat of
primer shall be accomplished within one hour of cleaning the panels. The primer shall be readied
IAW manufacturer's instructions. Unless otherwise specified, a single coat of the primer shall be
applied by spray, using a wet cross-coat, to a dry film thickness of 2.5 to 3.5 mils. The panel shall
be in a nearly vertical position during spraying and for at least two minutes after completion of
spraying. One gallon of primer shall be sprayed to verify The 300 square foot minimum coverage
IAW 3.4.1. Panels that are to be used for salt spray, humidity, or other tests where corrosion or
rusting of the panel is a factor shall be coated on both sides and shall be dip coated around the
edges to a distance of approximately 1/8-inch. The coating shall be air dried or baked as
applicable. Panels to be tested with the primer only shall be aged at least 10 days prior to testing.
4.6.3.2 Application of topcoats. After the primed panels have air dried, the specified topcoating
shall be applied by spray. Primer topcoating shall be applied to a dry film thickness of 2.0 to 3.0
mils, and air dried for at least 7 days prior to testing. Top coatings shall be the following:
a. Air drying, semi-gloss alkyd enamel for use on primed exterior metal surfaces.
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