MIL-DTL-53072E
3.4.2.4 Reduction.
3.4.2.4.1 Type II primer. If necessary and allowed, the admixed primer shall be reduced for
spraying up to 20 percent by volume with HAP-free thinner (see 3.7.1), thinner recommended by
the manufacturer or MIL-T-81772, type I or II.
3.4.2.4.2 Type III and IV primers. The type III and IV primers shall use only HAP-free solvents
that are approved by the Army Research Laboratory (see 3.7.1) or recommended by the
manufacturer to maintain the HAP-free material for application. The thinned primer shall be
thoroughly stirred, strained through a 60 mesh minimum paint filter or equivalent and allowed to
sit according to the manufacturer's recommended induction time prior to use and shall continue
to be stirred throughout the primer application. Mechanically mixing with an air agitator
shortens the induction time. Consult with manufacturer for reduced induction time.
3.4.2.5 Application. All surfaces to be painted shall be thoroughly cleaned as specified in 3.2 and
pretreated as specified in 3.3. To ensure a chemically clean surface, perform the test in 4.2.3.1.1.
Failure to comply with 4.2.3.1.1 is sufficient cause to do additional cleaning. After completion of
the 30 minute induction period, when required, the primer shall be sprayed to achieve a DFT of 1.5
± 0.2 mils (37.5 ± 5 microns). The primer needs only to be dry to touch at these film thicknesses
before applying the topcoat. This is usually between 30 and 60 minutes in accordance with ASTM
D5895, depending on conditions. Type II, III and IV material shall be used within 4-6 hours.
Potlife is shortened at higher temperatures. The largest factor affecting cure is temperature. At 70
o
F (21 ºC), the dry to touch time is between 30-60 minutes. Dry to handle time is 90 minutes to 4
hours depending on the coating type. The use of plural component metering spray equipment, if
approved by the manufacturer, eliminates the requirement to have an induction period of the mixed
primer before application and also eliminates potlife constraints.
3.4.2.6 Comments. The primer furnished under the specification shall be products which are
authorized by the qualifying activity for listing on the QPD (see 6.4).
3.4.3 MIL-DTL-53030 (Primer Coating, Epoxy, Water Based, Lead and Chromate Free).
3.4.3.1 Description. This primer is a water based, air-drying, corrosion inhibiting epoxy primer.
It is a two component system with a pigmented polyamide (component A) and a clear to milky
epoxy catalyst (component B). The primer is formulated HAP-free, lead and chromate free and
contains no more than 340 g/l (2.8 lbs/gal) VOC as applied, in accordance with Rule 1107 of the
South Coast Air Quality Management District. The primer is furnished in coating types II and
III. Type II is enhanced corrosion performance, water dispersible technology. The enhanced
corrosion performance includes 1,000 hours salt spray and 40 cycles on the cyclic corrosion test.
Type III is self contained portable kits. The kits contain the type II coating epoxy primer in a
touch-up system.
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