Cessna T188C - Page 413

MODEL 188-&
T188 SERIES
SERVICE
MANUAL
appropriate
activator to
the base with
vig-
b. Thin paint
with T-7945
thinner to spray
viscosity
orous stirring.
Thinners shall
be added
(approximately one to
one).
after
base and activator
have been
mixed
c.
Inspect for overspray
and apply
"burndown",
in the
proper ratio.
T-7945
thinner, to any
area showing
overspray.
When an induction time
is noted the mixed
18-9. MIXTURE AND APPLICATION
OF CESSNA
material
must be allowed
to stand for a
EPOXY COLOR (5400
Series.)
minimum of the
time indicated
before
a.
Thoroughly
stir and mix in
original container
spraying.
Failure to comply with
this re- to
make sure all pigments are
in solution.
quirement can
cause the finish
to fail in
b.
Mix required
amount of epoxy
with T-6487
ad-
later service.
duct.
Ratio is one
part paint to
one part T-6487
ad-
duct.
Pot
lifes
indicated
are
at
75°F.
higher
temperatures will shorten
the pot life. Do 18-10.
MIXTURE AND APPLICATION
OF POLY-
not use any material
that shows any
in- URETHANE
COLOR.
dication of premature gelation
(lumps,
a. Thoroughly stir and mix in
original container
skins,
markedly increased
viscosity,
ect.)
to make
sure all
pigments are
in solution.
even
if the pot life
has not expired
b. Mix
required amount
of 643-6-20
urethane with
X-310A
Converter.
Ratio is three
parts paint to
one
18-6. TOUCH
UP OF URETHANE
FINISHES
TO
part X-310A
converter. For
Jet Glo Urethane
Colors
BARE METAL.
follow instructions
in paragraph 18-5.
a. Clean
all surfaces
to be finished
with Naphtha.
Saturate
a clean lint
free cloth in Naphtha
and wring
18-11.
PRIMING OF
WELDED TUBULAR
STEEL
out
so no thinner
is dripping from
the cloth. Wipe
STRUCTURE.
The
welded tubular
steel section of
the aircraft surface
using the
Naphtha saturated
the aircraft is
a sealed, air-tight
unit, protected
cloth
and immediatly
following,
wipe the surface
with
one coat of epoxy
primer. After
a welded re-
with a dry,
lint free cloth,
pair has been
made on any part of this structure,
the
repair section
shall be primed
per paragraph
18-3.
NOTE
This also applies
to any welded or
brazed parts of
the aircraft.
It
is important
that
the
Naphtha
is
wiped
before
it evaporates.
Change
cloths
often
18-12.
PRIMING
OF TUBULAR
STEEL
COMPO-
so the
aircraft
surface
is thoroughly
clean-
NETS.
Steel
tubing
parts which
are
not welded
ed and the surface is
not contaminated
shut and cannot be sprayed
on the inside shall be
from
the use of a
dirty rag. Always
use
dipped
in Red Iron Oxide
Primer, and
then sprayed
clean
Naphtha for the
final cleaning.
Be
on the outside
with epoxy
primer per paragraph
18-3.
sure
the Naphtha
is disposed
of when con-
An
example would
be the flap
control lever.
taminated.
18-13. PRIMING
OF ENGINE
MOUNT.
The engine
18-7.
TOUCH
UP PAINTING
OF URETHANE
mount shall
be primed
with
high temperature,
Zinc
FINISHES.
Rich primer.
a. Because
urethane
finishes
cannot
be
burnt in,
they should
be applied in sections
when being
18-14. PRIMING
OF OPEN-END
TUBING.
If a re-
touched
up. All sections
should be marked
off to
pair necessitates
the replacement
of an
open-end
skin
laps, edges, or
strip lines. The
defect in the
steel tubing
where barrel
nuts are employed,
the
section
should
be removed
by sanding
with
320
tubing
shall be
oiled on the
inside.
After installation
sanding paper.
If possible,
avoid
sanding
through
of
the nut, seal
the open
end of the
tube with
Prets-
the
primer to bare
metal. If the
defect is such that
tite
579.6 sealer (Presstite
Engineering
Company),
a surfacer
is needed
to repair
the defect,
an epoxy
then brush
epoxy primer
on
the seal and
tube.
surfacer is recommended.
b.
Minor defects
to
bare
metal one
(1) square
inch
18-15.
PRIMING
OF
DETAIL
PARTS.
All
alumi-
and larger
should
be repaired
with wash
primer,
num and alumunized
steel detail
parts shall
receive
epoxy
primer
and urethane
topcoat.
one
coat of wash
primer
per paragraph
18-2,
and
c.
After the defect
has
been removed
and the
epoxy
one coat
of epoxy
primer per
paragraph
18-3 before
surfacer has sufficiently
cured, scuff
sand the entire
assembly.
surface
of the section
to break the
surface glase
of
the
finish. All
surfaces
to be painted
should
be tack-
18-16.
PRIMING
OF ASSEMBLIES.
All assemblies
ed off
prior to
application
of the urethane
finish.
The
or sub-assemblies
of metal
shall receive
a second
urethane
finish should be
applied in two
or three wet
coat of epoxy
primer on all
surfaces not exposed
on
uniform
coats for best
results,
the exterior
of the aircraft.
This coat shall
cover all
bare rivets, fasteners
and any
areas which
may have
18-8.
MIXTURE
AND APPLICATION
OF
CESSNA
been
scratched
or
chipped
during
assembly.
ACRYLIC
COLOR
(Dupont
Lucite
Acrylic
Lacquer.)
a.
Thoroughly
stir (Dupont
Lucite
Acrylic
Lac-
quer) to make
sure all
pigments are
in solution.
Revision 1 18-3