Technical data
6.12.11.4 Thinning. Package viscosity is generally ap-
propriate for brush application. Adjust viscosity of the primer
for spraying by thinning in accordance with the manufactur-
er’s instructions.
6.12.11.5 Application. Apply by spray (hot or cold
method) to solvent-cleaned, phosphoric acid treated or sand-
blasted steel. HVLP spray application is the preferred
method; however, the material can be applied by brush, but
only to small areas. Airless spray methods are not recom-
mended, as the higher pressure involved (1200-2200 PSI) can
result in the rapid packing of the pigment at valves and
orifices.
NOTE
• Vendor’s materials can vary to some extent
under the controlling Specification MIL-PRF-
26915. The specification requires inclusion of
mixing, thinning, application, and curing in-
structions in the package.
• It is very difficult to measure viscosity of this
primer by means of the standard authorized
measuring devices; therefore, it will not be
done. Use the proportion of thinner given by
the manufacturer, adjusting further in small
degrees to suit special conditions in accor-
dance with judgment of the painter.
6.12.11.6 Drying Time. At 75° F and 50% RH, it is tack
free in 1 hour and is fully cured in two hours. It can be
topcoated after 1 hour and up to 24 hours drying.
6.12.12 Paint, Aluminum, Heat Resisting (1200° F)
TT-P-28.
6.12.12.1 Characteristics. This is heat resistant alumi-
num paint capable of withstanding temperatures of 1200° F.
It is not intended to provide protection against corrosion as a
primary function. In high temperature areas on aircraft where
other paints will not survive, it will provide limited protec-
tion, primarily for steel components.
6.12.12.2 Uses. Can be used on superheated steam
lines, boiler casings, boiler drums, superheated headers, other
similar high temperature applications, and areas on aircraft
where operating temperatures exceed 400° F.
6.12.12.3 Thinning. As recommended by the manufac-
turer.
6.12.12.4 Mixing and Application. Because the pig-
ment settles out of suspension and cakes in the bottom of the
can, this coating requires thorough mixing on a mechanical
paint shaker before application. Apply by brush or by
spraying after thinning as recommended by the manufacturer.
6.12.12.5 Drying Time. When air drying at 75° F, it is
tack free in 1 hour, full hard in 3 hours, and fully cured in 24
hours. Baked at 400° F, it is fully cured in 1 hour.
6.12.13 Enamel, Alkyd, Gloss, Low VOC Content,
TT-E-489.
6.12.13.1 Characteristics. This is a high-gloss, air-
drying, alkyd enamel with excellent weather resistant prop-
erties. It is flexible and has satisfactory gloss and color
retention. It is lead and chromate free and VOC compliant
with a maximum of 420 g/L (3.5 lbs/gal).
6.12.13.2 Uses. It is used on properly pretreated and
primed exterior and interior metal and wood surfaces. Its
main use is for refinishing automobiles, construction equip-
ment, machinery, gasoline pumps, trucks, buses, passenger
and freight railway cars, metal drums (exterior), metal signs,
metal railings and fences, and marine use (above water).
6.12.13.3 Thinning. Use enamel thinner conforming to
A-A-3007. Add one pint of Thinner per gallon of enamel or
the amount recommended by the manufacturer.
6.12.13.4 Application. Brush-apply as issued. Spray by
HVLP methods after thinning.
6.12.13.5 Drying Time. This enamel air dries tack-free
in two hours, hard in eight hours, and full cure in 48 hours. It
may be recoated after 24 hours. Times are listed for 75° F and
50% RH.
6.12.14 Enamel, Heat Resistant (204° C or 400° F),
A-A-3054.
6.12.14.1 Characteristics. This is a one-component,
heat-resistant paint.
6.12.14.2 Uses. For coating metal surfaces subjected to
temperatures not higher than 400° F. Typical uses are steam
pipes, boiler fronts, automotive engine parts, and similar
applications.
6.12.14.3 Thinning. As recommended by the manufac-
turer.
6.12.14.4 Application. Apply by brush method as is-
sued or by HVLP spray methods after thinning as required.
6.12.14.5 Drying Time. At 75° F and 50% RH, this
enamel is tack free in two hours, and fully cured in 72 hours.
It can be recoated after air drying 24 hours.
6.12.15 Coating, Sprayable, Strippable, Protective,
MIL-PRF-6799.
TO 1-1-8
6-18