MIL-DTL-81706B
4.4.4.2 Paint adhesion panels (after repair).
4.4.4.2.1 Panels 9 through 17. Panels prepared, cleaned, and conversion coated in
accordance with 4.4.1 through 4.4.3 shall be finished with one coat of epoxy primer conforming
to MIL-PRF-23377. After the primer has dried for 5 hours, a polyurethane topcoat conforming
to MIL-PRF-85285 shall be applied. Panels shall be air dried for 14 days before testing.
4.4.4.2.2 Panels 18 through 26. Panels prepared, cleaned, and conversion coated in
accordance with 4.4.1 through 4.4.3 shall be finished with one coat of epoxy primer conforming
to MIL-PRF-85582. After the primer has dried for 6 hours, a polyurethane topcoat conforming
to MIL-PRF-85285 shall be applied. Panels shall be air dried for 14 days before testing.
4.5 Test methods.
4.5.1 Corrosion resistance. Panels prepared in accordance with 4.4 shall be used for
corrosion resistance testing of class 1A and class 3 materials. The selected specimens shall be
subjected to a 5 percent salt spray test in accordance with ASTM-B117, except that the
significant surface shall be inclined 6 degrees from the vertical. Specimens being qualified or
for lot acceptance (see 4.3.1) shall be exposed for the number of hours specified in table I. After
exposure, specimens shall be cleaned in running water with a temperature not greater than 100
°F (38 °C), blown with clean dry unheated air, and compared with the unexposed specimen for
the presence of corrosion to determine compliance with 3.5.1. Differences in color between test
panels and unexposed control specimens shall not be cause for rejection. Specimens from class
3 material, after exposure and cleaning, shall be allowed to air dry for 24 hours at room
temperature before testing for contact electrical resistance properties in accordance with 4.5.5 for
compliance with 3.7.
4.5.2 Paint adhesion (wet tape). Panels prepared in accordance with 4.4.4.1 shall be tested
for paint adhesion in accordance with FED-STD-141, Method 6301.3.
4.5.3 Paint adhesion (wet tape), after repair (applies to nonimmersion methods).
4.5.3.1 Repair procedure. Panels 9 through 26, finished as specified in 4.4.4.2, shall be
abraded to a shiny substrate using a Scotch Brite wheel or pad (see 6.6), or equivalent, as
approved by the qualifying activity. The abraded area shall be 4 square inches. The remainder
of the topcoat shall be lightly abraded to accept refinish primer. Class 1A, form VI, method D
material shall be applied to the abraded entire panel and conditioned in accordance with the
manufacturer's instructions. The entire surface of panels 9 through 17 and panels 18 through 26
shall be refinished as specified in the applicable section of 4.4.4.2.
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