MIL-STD-186 Protective Finishing For Army Missile Weapon SystemsThis standard establishes the minimum requirements for procedures, materials, and systems for cleaning, plating, painting and finishing metals, wood, electronic materials, parts and assemblies for rockets, guided missiles, and components to protect them from deterioration.

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MIL-STD-186F (MI)

in the topcoats. The precautions outlined by the primer manufacturer to avoid degradation of the primer prior to topcoating, as a result of outdoor exposure (especially in sunlight) shall be scrupulously observed.

5.5.4.4.5 Lacquer topcoating. Lacquer topcoating shall be accomplished in accordance with the requirements of the lacquer manufacturer.

5.5.4.5 Spraying over bare metal. Wash primer, when required, shall be applied in accordance with the wash primer manufacturer. Epoxy primers may be applied directly on steel that has been grit blasted to white metal.

5.5.4.6 Thickness of finish (dry thickness). The film thickness of each single dried coat of paint-type material shall be controlled within the limits given in Table

XI. The general finish shall be maintained below the maximum thickness specified to avoid cracking, flaking, checking, and excess weight of the paint finish. Where sanding surfaces is used, which is permitted only on limited areas and subject to the restrictions contained in 5.5.4.11, the thickness of the finish may be increased in these areas by 0.0006 inches. Where insignia and markings are added by painting, the total thickness of finish on these areas may be increased by approximately 0.001 inch. Where decalcomanias are used, the additional thickness is controlled by the decalcomania specification. The upper limits on film thickness are not mandatory for surface areas on which such limits are impractical to maintain; for example, contoured areas. Be aware that previously applied coatings to the test area must be identified prior to topcoating, such as repair or rework areas. These previous coatings must be measured and recorded in sequence to accommodate each progressive coating thickness determination.

5.5.4.7 Application of enamel. A thin coat or "tack" of enamel shall be applied with a light pass of the paint gun and, while it is still tacky, followed with one full wet coat. No mist coat shall be used after application of the wet enamel coat.

5.5.4.8 Application of lacquer. Lacquer shall be applied in accordance with applicable manufacturers recommended procedures.

5.5.4.9 Application of insignia and markings. Paint used for the application of insignia and markings shall be of the same specification as the background material. On bare metal the insignia shall be applied by means of a complete wash primer

plus primer plus topcoat finish scheme. On painted surfaces coated with a complete finish scheme only the top coat material is required for marking. The additional thickness of finish resulting from the application of insignia and marking shall be within the limits prescribed in 5.5.4.6. Workmanship shall be of high quality with clear, sharp outlines of characters. Any method that cause ridges in the application of insignia and markings shall be avoided as much as possible, and the use of a knife or any metal blade on the part in the application procedure is prohibited.