Raytheon Beech Baron E55 - Page 582

Raytheon
Aircraft
Company
BARON
55
AND 58
SHOP MANUAL
URETHANE
PAINTS
NOTE: The
procedures
contained
in this
shop
manual,
which
cover
the
preparation,
application,
and
care
of
Urethane
paints,
are
also
applicable
to
Acrylic
Enamel
paint
since it
is
considered
a
Modified
Urethane
paint.
The
need
for an
extremely
hard finish
for
protection
against
sandblast
during
takeoff and
landings
led
to
the
development
of
urethane
coatings
for
airplanes.
Urethane
paint
dries
into
a
high gloss
and retains
color
much better
than
standard
finishes.
It
is
unaffected
by
the
chemicals
in
hydraulic
fluids,
deicers,
and
fuels and
requires
far
less
care
and maintenance
than
other
finishes.
URETHANE
PAINT
REPAIR
PROCEDURES
NOTE:
The
time
normally
required
for urethane
paint
to
cure
must
be extended
at
temperatures
below
70"F.
The
paint
will
not
cure
at
temperatures
below
60"F.
The
surface
on
the
Baron
may
be
finished
with
pretreatment
(wash)
primer,
urethane
primer,
and
a
topcoat
of
urethane
enamel.
The
following
procedures
include
cleaning,
paint
stripping, prepaint
preparation,
priming, applying
a
urethane
topcoat,
and
an
alternate
method
for small
repairs
not
requiring paint
stripping.
Careful
observance
of
these
procedures
should
result
in
a
smooth,
hard,
glossy
finish
with firm adhesion
for maximum
life.
NOTE: Precut
strip
and
number
patterns
are
available
through
Mid-America
Markings,
Inc.,
1720
South
151st
Street
West,
Rt.
1,
Goddard,
Kansas
67052
PAINT
STRIPPING
AND
CLEANING
URETHANE
PAINT
Because
of
their
resistance
to
chemicals
and
solvents,
urethane
paints
and
primers
require
a
special paint stripper.
If
a
urethane
stripper
is
not
available,
a
good
enamel
stripper
may
be
used.
Removing
the
finish
with such
a
substitute
will
require
several
applications
while
working
the
stripper
in with
a
stiff
brush
or
wooden
scraper.
a.
Mask
around
the
edge
of the skin
or
skins
containing
the
damaged
area.
Use
a
double
thickness
of
heavy
paper
to
prevent
accidental
splashes
of
paint
stripper
from
penetrating
the
masking.
b.
Apply
urethane
stripper
as
indicated
by
the
manufacturer’s
directions.
Try
to
stay
approximately
1/8 inch
away
from the
masking tape.
This
will necessitate
a
little
more
cleanup
upon
finishing,
but will
prevent
damage
to
the
finish
on
the
next
skin.
The
stripper
will
not
attack aluminum
during
the
stripping
process
and
can
be neutralized
aften~vards
by
rinsing
the
affected
area
with
water.
CAUTION:
Urethane
strippers
usually
contain
acids
that
irritate
or
burn
the
skin.
Wear
rubber
gloves
and
eye
protection
when
using
the
stripper.
c.
Rinse the
area
with
water
and
dry.
d.
Wash the
stripped
area
carefully
with
a
solvent such
as
acetone,
methyl propyl
ketone,
or
lacquer
thinner.
This
will
prevent
tiny
particles
of loose
paint
from
adhering
to
the
stripped
area.
e.
Using
a
nylon
scratch
pad
or
aluminum
wool
dipped
in
clean
water,
clean
the
surface
with
a
cleanser
such
as
Bon
Ami,
Ajar,
Comet
Cleanser,
etc..
A
good
scouring
will
leave
the
surface
completely
clean.
f.
Thoroughly
rinse
with clean
water
and
carefully dry
the
affected
area.
If
the
stripped
area
includes
several
joints
of
skin
laps,
let
the
airplane
sit
until all
moisture has
dried.
This
may
be
accelerated
by
blowing
the
skin
laps
and
seams
with
compressed
air. Wet
masking
should
be
replaced.
E21
SECTION
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