Pontiac FIREBIRD 1972 Service Manual page 1415

FRONT AND REAR BUMPERS
FILLING
Material:
Part A
-
Flexible Resin
Part B
-
Resin Hardener
Equipment:
Putty Knife
Squeegee
Heat Lamp(s)
#
220
& #
400 Sandpaper
DA Sander w/ #80 Discs
Body File w/Holder
1. Clean the repair area with a wax, grease and silicone
removing solvent. With a DA sander adjusted to a
feathering action and fitted with a #80 grit disc,
remove the paint film in and surrounding the area to
be filled. This is necessary because the patching com-
pound will adhere only to the foam base material.
2. If the surface to be repaired is cut or gouged, use the
DA sander and a clean disc to enlarge the cut or
gouged area(s). This must be done to ensure removal
of grease, oil, or dirt from the area to be contacted by
the repair material. This action should also taper the
edges of the cut to minimize the possibility of high-
lighting the repair.
3. Mix the patching compound and hardening agent at
the prescribed portion as outlined in the procedure
enclosed in the package. The patching compound and
hardening agent should be mixed until a uniform
color is achieved.
4. Fill the repair area with the mixed compound to a
height slightly above the surrounding contour. Work
out air bubbles, if present.
5. Dress the patch to contour with a curved-tooth body
file, followed by sanding with
#
220 sandpaper and
block.
6. If the patch is uneven or porous, repeat steps 4 and
5.
REFINISHING
The factory paint is of an enamel base and requires sealing
prior to the application of the service endura paint which
is of a laquer base. Therefore, the polyurethane bumper
cannot be spot refinished. The complete bumper has to be
completely refinished using a Primer (sealer) prior to the
Color Coat and Clear Top Coat. Under no circumstances,
however, should acrylic paint materials be used in refin-
ishing this bumper. Although it may appear satisfactory,
it will crack from physical contact. As mentioned earlier,
the Primer (sealer) coat, Color Coats and Clear Top Coats
that are to be used are specially formulated with an elas-
tomer vehicle so that the cured film may bend under
impact without cracking or splitting.
Material:
Sealer
Primer Surfacer
Color
Top Coat Clear
Thinner
#
220 and
#
400 Sandpaper
Equipment:
Suction Spray Gun with same nozzle and air cap combina-
tion used for acrylic application.
1. Featheredge the repair area by dry-sanding with
#
220 sandpaper followed by
#
400 grit sandpaper.
2. Apply a coat of Primer (sealer) over the entire
bumper as well as the repaired area.
3. Apply Primer Surfacer to build up the repair area as
required.
4. Apply a coat of Primer (sealer) over the repaired
area, overlapping onto the non repaired area to assure
complete sealing of the entire bumper.
5. Thoroughly stir the color and apply in sufficient
quantity to achieve hiding only--one dry coat fol-
lowed by a wet coat.
NOTE: I f mottling occurs, the metalljc color
control method o f color application corrects
this problem.
6. Allow the color to dry 5 to 10 minutes at room tem-
perature.
7. Thoroughly mix and apply the top coat clear, using
two coats as done previously with the color.
C A UT I 0 N : Wet applica tion o f clear coats
causes considerable darkening of the color.
8. Air-dry of the clear coats require 8 hours at room
temperature. Force-dry is recommended for 1/2 hour
at 150"
-
170°F.
9. Compounding reduces the gloss, for this reason, rub-
bing compound should be used only if a reduction of
gloss is desired.
NOTE: In using this material the following
cautions should be noted:
All the bumper refinishing materials are packaged at
spraying viscosity. Only if "veiling" occurs during ap-
plication will additional reduction be necessary.
Reduce these refinish materials with the special Endura
Thinner only--never use acrylic thinner.
The top coat clear material has a tendency to yellow if
subjected to prolonged, elevated temperatures (300°F).
The clear coat tends to soften the color over which it is
applied. For this reason, premature featuring (within 24
hours) of air-dried film, as in overlap of a previously re-
paired area, will TEAR and PEEL the color off the sur-
face.