MIL-STD-186F (MI)
an end item shall not be based specifically on color. It shall be based on whether the paint was approved by the Army Research Laboratory, Weapons and Materials Research Directorate, ATTN: AMSRL-WM, Aberdeen Proving Ground, MD 21005, and whether application techniques are correct. As specified above, the paint must be applied at not less than 1.8 mils dry film thickness. A dust coat should be applied first before the second application for solvent flash-off. A single application of not less than 1.8 mils is permissible, provided the paint film is free of imperfections such as runs, sags, or orange peel.
Since this paint is extremely flat it will tend to mar and scratch to a slight degree when handled. As long as the marring and scratching is a small percentage of the paint film and it does not break through to the substrate, the piece of equipment shall not be rejected. This slight marring and scratching will not affect the camouflage properties when observed by photographic means. Before any painting is
performed, proper cleaning, pretreatment, and painting shall be adhered to assure that optimum adhesion is achieved. (See 5.5.4.6 and 4.25.2.3 for maximum limitations.)
5.5.4.15 Application to previously painted surfaces. When touching up damaged areas or applying a CARC topcoat to an existing topcoat, the procedure to be followed depends upon the type and condition of the existing finish. Items previously coated with lacquers or vinyls must be stripped down to the epoxy primer if present, or to the substrate if not. For rework, polyurethane and epoxy topcoats can only be applied over previously painted alkyd (two weeks cure minimum), epoxy or polyurethane topcoats.
5.5.4.15.1 Surface preparation. Scratches or other light damage to polyurethane or epoxy topcoats will require scuff sanding at the immediate blemish area, except as described in 6.5.9. Damage or corrosion extending to the substrate will require sanding and repriming. All traces of corrosion must be abraded from the substrate. The surface immediately surrounding exposed substrate should then be sanded, using a feathering-in technique, that is, sand away paint film (primer and topcoat) so that the thickness of the film is smoothly tapered from bare metal/substrate to the top of the paint film. Sanding of any type is followed by wiping down the exposed area to be painted using a clean rag wet with MIL-T-81772
thinner to remove all loose sanding debris, mill scale, grease, oil (including fingerprints), and diesel/gasoline residue. Do not use other petroleum or alcohol- based thinners or cleaning agents of any kind. All areas sanded down to bare metal shall be treated (sponged or hand wiped) with code 105 of Table I or wash pretreatment on steel, or wash pretreatment or MIL-C-5541 on aluminum, allowed to react for 15 minutes. The minimum area allowed for touch-up shall be agreed upon for each contract between the Government and the applicator.
5.5.4.15.2 Finishing procedures.
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