Raytheon Beech Baron E55 - Page 583

Raytheon
Aircraft
Company
BARON
55
AND
58
SHOP MANUAL
PRETREATMENT
(WASH)
PRIMER
FOR URETHANE PAINT
An
acid
etching primer
that
conforms
to
Specification
MIL-C-8514
should be
applied
to
improve
adhesion
of the
finishing
coats.
EC2016G
base and T6070
catalyst
(products
of
Ameron Industrial
Coatings,
Wichita,
Kansas)
are
used
in
equal
parts
as
a
pretreatment
wash
primer
at
the
factory.
a.
Mix
the
primer
in
accordance
with the manufacturers instructions.
b.
Apply
a
thin
wet
coat
of
primer.
It should
be
permitted
to
dry
for
at
least
one
hour,
but
not
over
six
hours,
before
the
next coat
of
urethane
primer
is
applied.
URETHANE
PRIMER
a.
Mix
the urethane
catalyst
and base
in accordance with the
manufacturers
instructions
when
preparing
the
primer.
NOTE:
For the
best
results
these directions
must
be
followed
carefully,
for
some
manufacturers
require
that
the
primer
be
allowed
to set
for
t
/2 hour after the
catalyst
and base
have
been mixed
while others
recommend
immediate
use
after
mixing.
b.
Apply
a
coat
of urethane
primer
with
a
spray
gun
using
35
to
40
psi
of
air
pressure.
A
dappled
appearance
only
indicates
that the
coat
is thin.
c.
If
the
initial
coat
is
allowed
to
cure
for
more
than
24
hours before
the
topcoat
is
applied,
sand
the
primer
slightly
to
roughen
the
surface
and
assure
adhesion.
Wipe
off
the
surface
with
a
cloth
dampened
with
a
solvent
(such
as
lacquer
thinner),
then
apply
the
topcoat.
APPLYING
URETHANE
TOPCOATS
a.
Mix the
paint
and
catalyst
as
directed
by
the
manufacturer.
b.
Apply
the
topcoat
with
a
spray gun
at
35
to
45
psi
of air
pressure.
Two
coats
are
required
to
fully
conceal the
primer
and build
up
the
topcoat
film
necessary
for
adequate
service life
and
beauty.
The urethane finish will
normally
cure
to
approximately
85%
of its full hardness in
24
hours
at
temperatures
of
80"F
or
higher.
URETHANE
TOUCH-UP
REPAIR
a.
Mask
around the
skin
containing
the
damaged
area.
b.
Remove
all loose
edges
of
paint
by using
a
high
tack adhesive
tape
around the
edge
of
the
damaged
area.
c.
Using
a coarse
sandpaper,
fair
the
edge
of the
damaged
area
with the
metal.
d.
When
the
edge
of
the
paint begins
to
fair into
a
smooth
joint,
use a
fine
grade
of
sandpaper
to
eliminate the
scratches
left
by
the
coarse
paper.
Take
care
to
avoid
removing
any
more
metal
than is
absolutely
necessary.
e.
Wash the
sanded
area
with
a
solvent,
such
as a
lacquer
thinner
or
methyl
ethyl
ketone.
Change
the wash cloths
used
forthis
purpose
often
so
that all the
sanding
dirt
will
be
picked
up.
f.
After
the
area
to
be
touched
up
has been
cleaned with
solvent
until
all
traces
of
discoloration
are
gone,
apply
a
thin
coat
of
pretreatment
primer
to
the
damaged
area.
Page
14SECTION
12
E21