has not become contaminated, e.g., with dirt or grease:
MIL-C-46168 coating fully cures in 7 days.
Touchup of Polyurethane System. Closely
inspect candidate areas for extent of damage and/or
touchup required. If inspection reveals major paint or
primer failure or damage, such as chipped or peeled
paint, the involved section should be prepared and
touched up. If only minor damage is found, e.g., paint
chipped or missing from screw/rivet heads and on outer
edges of skin panel(s) the specific area may be
prepared and touched up. Prepare damaged area(s)
and paint as follows:
This must be accomplished with full
adherence to provisions of health and
safety cited elsewhere and herein.
Thoroughly clean area to be repainted.
Feather edges of coating adjacent to peel
section and scuff sand the other area(s) to be coated.
Use 280 grit paper or nylon abrasive matting, MIL-
A9962, very fine for scuff sanding.
Solvent wipe scuffed area(s) with thinner,
Apply one thin coat of epoxy primer,
MILP-23377 on area to be touched up. Power Pak
spray unit, MIL-S-22805, may be a valuable aid in
accomplishing field touchup.
Apply one full wet coat of thoroughly
mixed polyurethane topcoat. If required, apply a second
coat after allowing 1 to 4 hours curing period for the first
Touch-up shall be accomplished with
brush and rollers only in open areas.
Inspection. The following tests provide a
measure of the quality of the painting job.
Viscosity test. See MIL-F-18264.
Test panel. Prior to spraying operations,
the suitability of materials for the entire system shall be
determined experimentally on a panel approximately 10
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 experimental
panel is satisfactory, full scale operations may begin.
Defects found in the experimental application such as
blushing, poor adhesion, excessive orange peel,
sagging, etc. shall be corrected prior to large scale
Adhesion test. See MIL-F-18264.
Gloss test. Not applicable to MIL-C-
46168 paints. See MIL-F-18264.
Smoothness test. See MIL-F-18264.
Storage of Painting Supplies. To prevent fire,
spoilage, and waste arising from improper storage and
surplus stock, the following precautions shall be
· Space heaters or other direct fired
heaters shall not be used to heat
storage areas. Paints and thinners are
· Floors should be concrete and drained
to one point; drain shall run to sump or
detached cistern and have deep trap.
The runoff from spilled paint, thinners,
or catalysts can cause contamination to
soil and water if not properly contained.
· Ventilation shall utilize screened inlets 6
inches above floor and screened vent
through roof. Fumes from thinners and
catalysts can cause sickness and may
be explosive in concentrated amounts.
Paint and thinners shall be stored where
possible in dry, fire resistant, well drained and well
ventilated structures, preferably separated from other
buildings, and under automatic sprinkler protection.
To avoid possible leakage arising from
corrosion of containers, protection shall be provided
against wetting by rain, snow, steam leaks, or other
sources of water.
Supplies shall not be stored in the
proximity of steam lines or other sources of heat to
avoid direct heat. It is recommended that steam heat
be used with coils above stock and screened to prevent