MIL-DTL-53072E
hours following application, the wash primer shall be stripped and the finishing process started
again. The pretreatment is sufficiently dry for priming one hour after application under preferred
atmospheric conditions of 60 to 90 ºF (16 to 32 ºC). The pretreatment shall not be applied to
visibly wet surfaces or where the surface temperature is less than 50°F (10°C). The dry film
thickness shall be 0.3 to 0.5 mils (7.5 to 12.5 microns). To prepare DOD-P-15328, the resin
component shall be stirred or agitated to ensure that all solids content are completely dispersed.
The acid component shall be added slowly with stirring, continuing until a complete blending of
the mixture is achieved. The pretreatment material is then ready for use. If the resin component
is thickened or gelled, do not add the acid component until fluidity has been restored. This can
be achieved by warming up the resin component. The pretreatment is most effective when
freshly mixed and shall be used within 8 hours after the addition of the acid component. The
quantity of the pretreatment mixed for use shall be the amount required for immediate
application. The acid component is not a thinner. It is a necessary activator and shall be used
exactly as directed by the manufacturer. When thinning is required for spray application, follow
the manufacturers' recommendations.
3.3.2 Aluminum surfaces. Aluminum surfaces shall be treated as soon as possible after cleaning
as specified in 3.2 with one of the following:
a. Anodized aluminum and aluminum alloy castings in accordance with MIL-A-8625.
Minimum thickness of 0.0007 inches (.018 mm) is required for wrought aluminum and
0.0004 inches (.010 mm) is required for castings.
b. Chemical conversion conforming to MIL-DTL-5541.
c. Wash primer conforming to DOD-P-15328 or MIL-C-8514.
d. Pretreatments qualified under TT-C-490, including organic and inorganic
pretreatments and pre-primer coatings conforming to types III, IV and VIII, class B or C.
3.3.3 Magnesium alloy surfaces. Prior to painting, magnesium alloy surfaces shall be treated in
accordance with SAE-AMS-M-3171, type I or III, or DOD-P-15328 with half of the specified
phosphoric acid. Treated surfaces that become scratched in handling shall be touched up in
accordance with SAE-AMS-M-3171, type I. To maintain a system that is free of hexavalent
chromium, MIL-DTL-5541, type II or commercial product recommended by the manufacturer
and approved by the Program Manager shall be used. For approved products based upon
memorandums, contact US Army Research Laboratory, RDRL-WMM-C, Organic Coatings
Team, Aberdeen Proving Ground, MD 21005.
3.3.4 Wood surfaces. Unless otherwise specified (see 6.2), wood shall be pressure treated and
marked in conformance with AWPA-T1 for above ground, or AWPA-P5 for ground contact
installations. Wood shall be dried to the specified moisture content appropriate for the size,
species, and ultimate service conditions, but in no case greater than 20 percent. Wood painted
with CARC shall first be sealed with a polyurethane-based wood sealer.
3.3.5 Stainless steel surfaces. These surfaces shall be treated as soon as possible after cleaning
as specified in 3.2 or by one of the alternative methods described in ASTM A380 if the surface is
still active. Abrasive blasting shall be specified prior to application of a wash primer conforming
to DOD-P-15328 or MIL-C-8514 (see 3.3.1 b and 3.3.1.1). Where wash primer is not allowable,
a minimum of a 0.5 mil profile shall be achieved using aluminum oxide or other non-ferrous
abrasive blasting media prior to painting.
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