Advertisement
BODY 1A- 1 1
supports with Methylene Chloride solvent .
It
is important that all surfaces be clean and free
of surface contaminants such as shop dirt,
grease, drawing compounds, and overspray .
Safety gloves should be worn when cleaning
with solvent .
PRIMER
BEFORE
WORKING
WITH PRIMER,
BE
SURE
TO
READ
MANUFACTURER'S
IN-
STRUCTIONS AND TAKE ALL NECESSARY
SAFETY PRECAUTIONS .
SPECIFICALLY,
AVOID ALL SKIN CONTACT AND USE ONLY
IN WELL VENTILATED AREA .
Primer
is used because it will promote
adhesion and help prevent corrosion . It should
be used on all bond surfaces before adhesive is
applied .
It
is
important
that
primer
base
be
thoroughly
agitated .
No
settled
pigment
should remain on the bottom of the container.
Mix equal parts by volume of primer base and
accelerator,
such
as 3M EC-1945 B/A
or
equivalent. Follow manufacturer's mixing and
use instructions .
Primer may be sprayed, or brushed on with a
clean brush.
Apply a "mist" coat or a thin
brush coat of primer to all sanded structural
surfaces.
Do not spray heavy coat or let
primer run on surface .
Drying time is dependent upon ambient
temperature,
air
movement
and
relative
humidity . Cure primer by air drying or heating
to a minimum temperature of 150 0 F . (65 0 C.)
for 15 to 30 minutes.
Temperature must not
exceed 250 O F . (121 0 C .) at any time .
Heat
lamps normally used for paint curing may be
used when heat drying . If air drying, cure for
a minimum of one hour at room temperature .
NOTE: Adhesive must be applied within 16
hours of primer application to achieve maxi-
mum adhesion. If primer is exposed beyond
16 hours, surface must be reprepped and
reprimed .
ADHESIVE
for bonding aluminum, polyester and steel .
Adhesive should be used onl~ at room temp-
erature of about 75 0F . (24 C .) as viscosity
increases at lower temperatures. Also, if heat
dry has been used for primed areas, be sure
that panels and frame sections to be bonded
are cooled to room temperature before pro-
ceeding .
Hot surfaces will greatly shorten
adhesive work life and lower ultimate bond
strength.
It
is essential that bonding surfaces be
thoroughly clean, dry and grease-free to main-
tain good adhesion.
Also, be sure that all
fixtures, clamps, metering devices and safety
equipment are at hand before mixing adhesive .
Mix
adhesive
just
prior
to
application,
keeping in mind that adhesive work life is from
15
to 30
minutes (normally closer
to 15
minutes) .
Follow manufacturer's mixing and
curing instructions .
It is very important that
mix be "on ratio" to obtain maximum bond
strength.
Using
disposable
adhesive
cartridge
and
applicator, apply about a 3/8-inch diameter
bead to bonding surface (either stationary part
or new panel, but not both) . Use two beads for
wide area .
Application with putty knife not
recommended .
Adhesive
must
wet
total
surface area being bonded to assure maximum
adhesion .
NOTE:
After the
new panel has been
positioned on the body, it will be necessary
to see a "witness bead" of excess adhesive
along the edge of the panel . This will assure
that adhesive has been properly applied .
One 6-oz . cartridge will normally bond about
6-8 lineal feet unless large mismatch of
parts requires greater quantity .
FIXTURING
Put replacement panel into position before
adhesive cures and press firmly into place by
hand .
Clean cotton or plastic gloves are
recommended to
prevent contamination
of
primed panels and to keep adhesive off the
hands.
BEFORE
WORKING
WITH
BODY
AD-
HESIVES,
BE
SURE
TO
READ
MANU-
FACTURER'S
INSTRUCTIONS
AND
TAKE
ALL NECESSARY SAFETY PRECAUTIONS .
SPECIFICALLY, AVOID ALL . SKIN CONTACT
AND
USE
ONLY, IN
WELL
VENTILATED
AREA .
Use
adhesive
such
as manufactured by
Minnesota Mining and Manufacturing, EC-3549
B/A, or equivalent.
This is a two-part (base
and accelerator) urethane adhesive designed
NOTE:
If adhesive gets on gloves, they
should be discarded before further handling
of panels.
Adhesive will definitely leave
blemish marks which are difficult to remove
from exterior panel surface.
Next, insert pop-rivets where indicated to
prevent movement of panel while adhesive is
curing .
Use
closed-end
(i .e., waterproof)
rivets for roof seams . Clamp as practical and
necessary .
Advertisement
