MIL-STD-193 Painting, Procedures And Marking For Vehicles, Construction Equipment, Material Handling Equipment, And Spare PartsThis standard establishes minimum requirements for materials to be used and procedures to be followed in surface preparation, surface treatment, plating and painting of vehicles, construction and material handling equipment, and markings so as to provide protection from the adverse effect of chemical and environmental conditions.

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MIL-STD-193L

5. DETAILED REQUIREMENTS

5.1 Preparation and application. The preparation of surfaces and application of CARC shall be in accordance with MIL-C-53072 using materials as specified in table II of this standard. Paint finish applications not specified in MIL-C-53072 or this standard shall be applied as instructed by the coating manufacturer.

5.2 Condition of surface. All surfaces shall be examined just prior to painting to ensure that they are properly cleaned, pretreated, dry and free of oil, grease, wax, scale, rust or contamination of any kind. Immediately prior to painting, the surface shall be subjected to a water break test and evaluated in accordance with MIL-C-53072.

5.3 Surfaces after painting. After application of the final film of paint, the surface shall have a smooth, continuous, adherent film which is free of visual surface imperfections affecting performance or appearance, such as: incomplete coverage, runs, sags or blisters.

5.4 Paint finishes. Basic paint finishes shall meet the requirements specified in table II for steel, aluminum, magnesium, and other non-ferrous metals, wood and reinforced plastics. Finishes for special applications (exceptions to standard finishes) shall meet the requirements specified in table I. Each paint finish, unless otherwise specified, shall consist of cleaning, pretreatment, primer and topcoat, with coating thickness as specified in table III. If circumstances make it desirable, primer or intermediate coats may be applied to unassembled components of an assembly and the topcoat applied after assembly. When finish requirements are to be specified in drawings, contracts or in item specifications, the finish note shall be specified in such a way to permit the contractors the option of utilizing any one of the approved coating materials.

5.5 Metallic finishes. Metallic coatings and platings for application to assemblies, or parts thereof, shall be in accordance with table IV as applicable.

5.6 Miscellaneous treatments. Finishes (or processes) other than paints or platings for application to assemblies or parts shall be in accordance with table V. Specific finishes shall be selected with respect to the base metal to be protected.

5.7 Galvanic couples. Permissible dissimilar metal couples are shown in table VI by the graphs in the right column. Members of groups connected by lines shall form permissible couples where corrosion, as a result of galvanic action, is most likely to occur.

5.8 Tests.

5.8.1 Paint Adhesion. Paint adhesion shall be verified with a scribe tape test after the top coat is cured. The location for the scribe tape test shall be in an obscure location and be