Cessna T188C - Page 412

MODEL 188
& T188 SERIES
SERVICE
MANUAL
NOTE
The
materials
required
and called
out
in this
Section
may
be obtained
from the
Cessna Supply
Division.
18-1.
GENERAL.
Detail
parts
are
wash
primed
or
18-3.
MIXTURE
AND APPLICATION
OF
EPOXY
chemically
treated,
epoxy
primed.
Assemblies
and
PRIMER.
sub-assemblies
are
then epoxy
primed
after
assem-
a.
Mix two
(2)
parts
825-8136
primer
and
one
part
bly.
The
exterior
of
the aircraft
receives
an
overall
VG 8392
activator.
Mixthoroughly
and
allow
to stand
topcoat
of
white
epoxy
after
wash prime
and epoxy
for 1 hour
before
spraying.
Epoxy
primer
has a
pot
prime
coats
are
applied.
The
stripe
color
is then
life
of
eight
(8)
hours.
applied
over
the
white
epoxy
base
coat.
The follow-
b. Primer
may
be thinned
with
T-3871
thinner
up
ing
procedures
outline
mixing
and
application
of
wash
to 40%
for
spraying
viscosity.
Exact
thinning
can
prime,
epoxy
prime,
epoxy
topcoat,
and
stripe
color
be varid
to fit
the available
equipment.
(in that
order). Where
external
finish
has been re-
c. Apply
the epoxy
primer to
a dry film
thickness
moved
to
bare
metal,
apply
the wash
prime,
epoxy
of
approximatly
.0007
Inches.
prime,
epoxy
topcoat
and
(if applicable)
the stripe
d. Allow
the primer
to air
dry
at least
two hours
color.
Agwagons
prior
to serial
number
188-0251
before
application
of
the
topcoat.
were delivered
with an acrylic
stripe over
the epoxy
base coat.
Serial
number
188-0251
and on
were
de-
18-4.
MIXTURE
AND
APPLICATION
OF WHITE
livered
with
an epoxy
stripe
over
the epoxy
basecoat.
EPOXY
TOPCOAT.
Beginning
with
serial
18800833
aircraft
may have
the
a.
Mix required
amount
of epoxy
with
VG8339
acti-
optional
urethane
topcoat
and stripe
and beginning
vator
in a
1:1 ratio.
with aircraft
serial 18802840
the AGwagon
will have
urethane
topcoat
and
stripe
standard.
Refer
to air-
NOTE
craft finish
and trim
plate for type
of paint.
These mixtures
shall set
for a minimum
of 45
NOTE
minutes,
then
be agitated,
before
spraying.
Epoxy
and urethane
finishes
are
very difficult
b. Reduce
mixture
approximately
10 to
15% to
to remove
with
thinner
or solvent.
Usually
spraying
viscosity
with
T-3871
thinner.
Thinning
they must
be sanded
or a paint
remover
must
ratio
may
be varied
to fit
the available
spraying
be used.
equipment.
c. Apply one wet even coat to completely cover the
18-2.
MIXTURE
AND APPLICATION
OF ETCH
epoxy
primer.
Allow
to dry
for 30
minutes
and ap-
PRIMER.
ply second
coat.
a.
Mix 1 part
of P60G2
primer
and
1 1/2
parts
d. Let
air-dry
for eight
hours
at 70F.,
or
force
R7K44 reducer.
dry for four
hours at 130F.
b. Allow mixture to stand for a minimum of 30
minutes
before
spraying.
18-5.
MIXTURE
AND
APPLICATION
OF POLY-
URETHANE
TOPCOAT.
NOTE
a.
Mix
the required
amount
of
urethane
Jet
Glo
Series with Jet Glo Catalyst 578-520 in a 1 to 1 ratio.
Wash
primers
should
be mixed
only
in
Mix
thoroughly
and
allow
to stand
for approximately
quantities
required
for
use within
six
(6)
30 minutes
before
spraying.
Jet Glo
urethane
has
a
hours
and
then only
in a
stainless
steel
potlife
of six (6)
hours.
If faster
cure
time is
desired
container.
Mixed
primer
shall be
dis-
120-975
accelerator
may
be added
to
the mixed
ma-
carded
if not
used
within six
(6) hours.
terial in
quantity
of 1/2
to 1 fl.
oz.
per gallon.
If
Air pressure
at the
gun should
be approx-
120-975
is used
no induction
time
is necessary.
Pot
imately
40 psi.
Keep the
gun 6
to 8 inch-
life is shortened
to 1 - 2
hours.
es
from the
work
and perpendicular
to
b. Urethane
may may
be thinned
with
Jet Glo
thinner
the surface
being
primed.
DO
NOT
PAINT
T-10399
to
obtain
a spraying
viscosity.
110-650
or
WITH
AN ARCING
MOTION.
Finishes
110-655
may
be used
also.
should
be applied
in an
uniform wet
coat.
c. Apply
one wet
even coat
to completely
cover
the
epoxy
primer. Allow
sufficient
time for this
coat to
c. Apply
the
etch primer
in one
well
atomized
tack
and apply
a second
coat.
wet
even
coat
to .0003
to
.0005
inch dry
film
d.
Jet
Glo Urethane
finishes
usually
require
12 -
thickness.
16
hours
air dry
at 75°F
to become
tape
free and
are
d. Allow
primer to
dry until
a firm pressure
with
not
fully cured
till seven
(7) days.
Accelerated
with
the
fingernail
will
not
penetrate
the
coating
120-975
tapefree
time
is 4 -
6 hours.
(approximately
30 minutes).
e. Overall
dry
film thickness
should
be about
2. 0
mil.
NOTE
NOTE
Primer
shall be coated
within
four (4)
hours of
application.
All materials
shall
be mixed
by adding
the
18-2
Revision
1