Pontiac tempest 1968 Service Manual page 675

14-6 1968 P O N T I A C SERVICE M A N U A L
Fig. 14-5 Tempest Front Bumper
6. Remove the heat lamp and allow the patch to
return to room temperature. The repair mix will
harden with cooling.
7. Dress the patch to contour with a curved-tooth
body file, followed by sanding with #220 sandpaper
and block.
CAUTION: The cured repair material is slightly
harder than the original foam and may easily be
undercut.
8. If the patch is uneven or porous, repeat steps
4 thru 7.
b. R E FINISHING
Refinishing the patched area amounts to no more
than a standard paint procedure. Under no circum­
stances, however, should regular paint materials be
used in refinishing this bumper. As mentioned ear­
lier, the glaze coat, color coats, and clear top coats
that are to be used are specially formulated with an
elastomer vehicle so that the cured film may bend
under impact without cracking or splitting.
Material:
Glazing Compound
Color
Top Coat Clear
Thinner
#220 and #400 Sandpaper
Equipment:
Suction Spray Gun with same nozzle and air cap
combination used for acrylic application
1. Featheredge the repair area by dry-sanding
with #220 sandpaper followed by #400 grit sandpaper.
2. Thoroughly mix the glazing compound and
spray-apply the material in the same manner as PX
primer-surfacer. Apply two or three coats, allowing
flash-time between coats.
3. Allow 15 to 30 minutes drying time at room
temperature. When dry, water-sand the glazed area
with #400 sandpaper. Block-sand for maximum
leveling.
NOTE: Dry-sanding clogs the sandpaper due to
the elastomer-type vehicle used in the compound.