gal]\) as supplied by the manufacturer.

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MIL-PRF-85582E

3.6 Physical properties - film.

3.6.1 Surface appearance. The admixed primer coating, applied to a vertical surface, shall

not sag, run, nor streak. The dried film shall have a smooth, uniform surface free of grit, seeds,

craters, blisters, and other irregularities when applied in accordance with 4.4.1. No orange peel

(wavy appearance) shall be visible when viewed from six feet away.

3.6.2 Drying time. The applied primer coating shall be tack-free within 60 minutes and

shall dry hard within 6 hours (see 4.5).

3.6.3 Lifting. There shall be no evidence of lifting nor any other film irregularity upon

application of a gloss polyurethane coating conforming to MIL-PRF-85285 to a primer coating

that has air dried for 2, 4, and 18 hours, respectively (see 4.5.3).

3.6.4 Adhesion. There shall be no peeling or delamination between the primer and topcoat

or at the primer and substrate interface. The coatings shall have a rating of no less than 4A when

examined in accordance with ASTM D3359 (see 4.5.4).

3.6.5 Flexibility. The primer coating shall exhibit an impact elongation of not less than

10 percent (see 4.5).

3.6.6 Infrared reflectance (type II primer coating only). The total reflectance (specular and

diffuse) of the type II primer coating, relative to barium sulfate, shall be not greater than ten

percent throughout the range of 700 to 2,600 nanometers (nm) (see 4.5.6).

3.7 Resistance properties.

3.7.1 Water resistance. The primer coating, with and without topcoat, shall withstand

immersion in distilled water maintained at 49 �3� C (120 �5� F) for four days without exhibiting

any evidence of wrinkling, blistering, or any other coating deficiency (see 4.5.7).

3.7.2 Corrosion resistance.

3.7.2.1 Salt spray. The primer coating, with and without a topcoat, shall not exhibit

blistering, lifting of either coating, nor substrate pitting after exposure to a 5 percent salt spray

for 2,000 hours. There shall be no white corrosion or pitting in the scribe (see 4.5.8.1).

3.7.2.2 Filiform. The topcoated primer coating shall not exhibit filiform corrosion

extending beyond 6.35 millimeters (mm) (0.25 inch) from the scribe, and the majority of the

filaments shall be less than 3.175 mm (0.125 inch) in length (see 4.5.8.2).

3.7.3 Solvent resistance (cure). The primer coating shall withstand 50 passes (25 back and

forth rubs) with a cloth rag soaked in methyl ethyl ketone (MEK). Rubbing through to bare

substrate constitutes failure of the primer coating to properly cure (see 4.5.9).