Technical data

7.8 APPLICATION OF MARKINGS WITH SILK-
SCREEN.
This method can be used for painting internal and external
markings and insignias.
7.8.1 Materials and Equipment for Silkscreening.
Equipment:
Locally fabricated or commercially procured silk-
screens are both authorized. Screen should be
polyester monofilament (220-280 mesh).
Silkscreen, squeegee, commercially procured.
Materials:
Colored marking paint, MIL-PRF-81352, Type I -
Acrylic, Type II - Alkyd, Type III - Polyure-
thane.
Thinner, MIL-T-81772, Type I and III.
Topcoat, MIL-PRF-81352, Type I, II, or III, clear.
7.9 SURFACE PREPARATION.
Prior to silk-screening, wipe area being marked with one of
the ketones or non-terpene solvent blends in Table 3-2.
Freshly painted surfaces require no cleaning.
7.9.1 Application. Mount the silkscreen securely on the
aircraft or equipment being marked.
MIL-PRF-81352 Types I, II, or III are flammable
and toxic to eyes, skin, and respiratory tract. Eye
and skin protection required. Good general ven-
tilation is normally adequate.
NOTE
• The silkscreen paint being used may be either
acrylic, alkyd, or polyurethane, unless other-
wise specified in the system specific technical
order.
• If the silkscreened marking requires a clear
topcoat, ensure it is compatible with the silk-
screen and the base paint materials.
a. Place just enough paint on the top of the silkscreen, just
above the design to completely cover the design when
drawn. Using a square edge squeegee, draw the paint
across the silkscreen design using firm constant pres-
sure. When complete, remove the screen from equip-
ment.
b. Clean screen, squeegee and other equipment using
applicable thinner.
7.9.2 Topcoat Application. Silkscreened markings ap-
plied over a basecoat of MIL-PRF-85285, Type I, polyure-
thane paint may also have a topcoat of clear MIL-PRF-85285
polyurethane, applied using an air spray gun, to improve the
abrasion resistance of the silkscreen design. To avoid blurring
of the silkscreen ink, apply a light coat of the clear polyure-
thane initially. Follow with heavier coats and allow to cure
dust- free.
7.10 APPLICATION OF MARKINGS USING STEN-
CILS.
This method can be used for painting internal and external
markings and insignias. The use of locally fabricated or
commercially procured stencils are authorized. Use of sten-
cils cut from a vinyl material on a computerized stencil
machine are preferable.
7.10.1 Surface Preparation. Prior to stenciling, wipe
area to be stenciled with one of the ketones or non-terpene
solvent blends in Table 3-2. Freshly painted surfaces require
no cleaning.
7.10.2 Mounting Stencil. Stencil may be taped into
position using MIL-T-21595/SAE AMS-T-21595, Type 2,
Masking Tape or alternatively use 3M Co. (Cage Code
34360) Repositionable Spray Adhesive 75, PN 3M-75. This
adhesive will securely hold the stencil but will not leave any
residue when removed. The adhesive is sprayed on the back
of the stencil prior to mounting and will remain tacky enough
to be reused several times. For the vinyl stencil mask material
cut on the computerized Stencil machine, peel the protective
backing off the self adhesive side, mount on the surface being
marked, remove the cut out sections, and make sure all edges
are adhering to the surface. This stencil mask material is
easily peeled off the surface after stenciling and leaves no
residue.
7.10.3 Painting of Stencils. Stencils shall be applied by
using spray, brush or roller application methods. Use the
same type of paint as the topcoat.
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