MIL-STD-171F
5.2.3.1 Film thickness for spectral camouflage. Where spectral camouflage top coats
are used, a minimum of 1.8 mils dry film thickness shall be applied. A nominal thickness range of
2-3 mils is best stated to assure meeting the "minimum" requirement.
5.2.4 Faying surfaces.
5.2.4.1 Wood. Wood in contact with metal shall be painted according to finish 26.1 (table XVIII). The opposing metal surface shall receive the required thickness of epoxy primer.
5.2.4.2 Metal. All metallic faying surfaces, whether of similar or dissimilar metals shall receive the required thickness of epoxy primer except at slip fits as mentioned below. Extra protection for dissimilar metals may be provided with sheet or tape. After joining is complete and prior to topcoating, fillet seal all joints where moisture could enter from the top or horizontal with sealant MIL-PRF-81733. At slip fits or press fits, coating with one of the primers listed above, and assembling while wet, affords some protection. However, such treatments cannot take the place of proper sealing and painting of joints.
5.2.5 Adhesion. All paint finishes shall show good adhesion to substrates and to other paint coatings when tested to the applicable paint specification or as required in TT-C-490.
5.2.6 Appearance. All paint systems shall have uniform and satisfactory hiding power, color, gloss and smoothness.
5.2.7 Color. When a paint specification provides for more than one color, the design/procuring activity shall select the color and reference it on drawings, in contracts or in item specifications by the corresponding number in FED-STD-595.
5.2.7.1 Color for Army. Unless otherwise specified, all new material and material undergoing depot overhaul shall be painted with Chemical Agent Resistant Coatings (CARC) conforming to MIL-DTL-53039 in color Green 383 for exterior and with CARC conforming to MIL- PRF-22750 in the selected color for interiors. CARC painted equipment will be stenciled with the acronym "CARC" followed by the year of application. It must be located near the data plate and applied against a camouflage green or brown background, if pattern painted. For exteriors, when other colors are used, they shall be CARC conforming to MIL-DTL-53039 and will usually be color Brown 383 and Black. Other colors of CARC conforming to MIL-DTL-53039 may be used for exteriors of items having special requirements, e.g., Artic or Desert use, ammunition, aircraft, etc. An item of material painted with a three color pattern identifies the coating as CARC. The acceptance of the coating shall not be based on a specific visual color match (see 6.10)
5.2.8 Corrosion resistance. Unless otherwise specified, all primer coatings shall be capable of passing the salt spray requirements of the applicable paint specification when called out for the hardware item.
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