least set to touch or completely cured. It should not be
applied over an existing alkyed or lacquer finish.
Solvent wipe scuffed area(s) with thinner,
b. Top Coat (Mixing and Thinning). Consult
Military Specification MIL-T-19588.
MIL-C-53039 or paint manufacturer's instruction.
Apply one thin coat of epoxy primer, Mil-
itary Specification MIL-P-23377 on area to be touched
Apply one full wet coat of thoroughly
mixed polyurethane topcoat. If required, apply a sec-
ond coat after allowing 1 to 4 hours curing period for
the first coat.
Touch up shall be accomplished with
brush and rollers only in open areas.
Apply paint per MIL-DTL-53039 or manu-
This must be accomplished with full adherence
to provisions of health and safety cited else-
Touch up of polyurethane system. If the
where and herein.
old finish is in good condition, clean the surface with
as grease, oil or fuel residue, and apply the topcoat.
Areas sanded down to bare metal shall be pretreated,
primed and then topcoated. Scratches or light damage
to top coat will have to be scuff sanded at the damaged
area. Prepare damage area and paint as follows:
c. Test Panel. Prior to spraying operations, the
Clean area to be painted.
suitability of materials for the entire system shall be de-
termined experimentally on a panel approximately 10
Mask or tape the area to be repaired or
to 32 inches in size. The panel shall be coated under
prevailing conditions with the finish system that is to be
applied. If the finish system applied to the experimen-
tal panel is satisfactory, full scale operations may begin.
Scuff sanded area to be painted.
Defects found in the experimental application such as
blushing, poor adhesion, excessive orange peel, sag-
Wipe down area to be painted with a clean
ging, etc., shall be corrected prior to large scale appli-
ing debris and fingerprints.
Apply evenly one coat of epoxy primer
e. Gloss Test. (Not applicable to MIL-C-46168
over the area to be touched up. Allow epoxy primer
paints). See MIL-F-18264.
to dry a minimum of 1 hour or until dry to touch before
Film Thickness Test.
Apply topcoat evenly to blend with the
original surface around the area to be touched up. The
total thickness of previous coating shall be checked
prior to reworking. The coating thickness, existing plus
MIL-DTL-53039 is a aliphatic polyurethane,
rework, shall not exceed a dry film thickness of 1.8 mils.
single component, chemical agent resistant coating
MIL-DTL-53039 will dry set to touch in approximately
(CARC) used as a finish coat on tactical equipment. It
15 minutes, dry hard in 90 minutes, dry through in four
is a moisture cured finish which is lead free and chro-
hours, with a complete cure in seven days. At 60F
mate (hexavalent) free, and has a maximum voc of 420
(16C), MIL-DTL-53039 requires twice as long to cure.
gm/1 (3.5 lbs/gallon) volatile organic compounds. This
coating is applied over epoxy primers MIL-P-53022,
Touch up shall be done in open areas
MIL-P-53030 or MIL-P-85582. It can be applied over a
when using brushes or rollers.
CARC basecoat which is thoroughly cleaned and is at