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

4. GENERAL REQUIREMENTS

4.1 Surfaces to be painted. Unless otherwise specified in individual engineering drawings, all vehicular parts and assemblies shall be cleaned, treated, primed, and topcoated as specified in this standard. Spare parts shall be prepared and painted the same as the original part.

4.2 Surfaces not to be painted. Painting shall not be required on certain types of surfaces, such as: fabrics, plastics, rubber, glass, dataplates, and metal parts not requiring corrosion protection or where paint interferes with function and surfaces intended for electrical contact or heat transmission. CARC shall not be used on surfaces which attain a temperature exceeding 400 degrees Fahrenheit (°F). Unless otherwise specified, surfaces exceeding 400°F shall be painted with heat resistant paint per table I.

4.3 Materials. Materials specified in this document shall conform to the requirements of their respective specifications.

4.4 Substitution for specified finishes, processes or materials. If, due to special conditions of service or design, the contractor considers that finishes, processes or materials other than those specified herein are necessary or more suitable, such finishes, processes or materials shall be used only upon receipt of prior written approval from the contracting officer. Unless otherwise specified, the contractor shall demonstrate the suitability of the proposed substitute by submission of samples, test specimens, test data or other evidence as required by the acquiring activity.

4.5 Phenolic environment. Unpainted zinc-base alloy parts and unpainted parts plated with either cadmium or zinc shall not be used in totally unventilated assemblies when such use may subject the parts to vapors emanating from phenolic insulating varnishes, phenolic encapsulating compounds, uncured phenolic materials or air-drying alkyd paints.