Pontiac Fiero 1988 Service Manual page 134

BODY PANEL REPAIR 2C-3
C A U T I O N : T h e r e
are a number of paint
sf stems available for service use; how-
e v e r , m a n y r e q u i r e a d d i t i v e s c o n t a i n i n g
isocyanates. It is essential that all rec-
ommendations and warnings listed on
the container label f o r materials
selected be followed.
CAUTION: If the paint system selected
specifies an additive containing isocya-
nates, it is mandatory that adequate
respiratory protection be worn. An
example of such protection is an air line
respirator with a foil hood or half mask.
If not available, use a vapor/particulate
respirator that the respirator supplier
recommends as effective for isocyanate
vapors and mists (unless local regula-
tions prevail).
Such protection should be
w o r n
during
the entire painting process. Persons
with respiratory problems, or those
allergic to isocyanates must not be
exposed to isocyanate vapors or spray
mist.
a. Following paint manufacturer's label
directions, activate the Polyurethane
Enamel Clearcoat material. Mix material
thoroughly. Pot life of activated mixture
is approximately eight (8) hours.
b. Reduce clearcoat per label directions.
Some activated Polyurethane Enamel
Clearcoat materials are ready to spray as
packaged under normal conditions. As
conditions vary, to enhance flow out and
leveling, up to 10% more than the speci-
fied enamel reducer may be added to the
activated clearcoat mixture. Check the
viscosity of the activated mixture with a
Zahn # 2 paint viscosity cup or its equiva-
lent. Follow the paint manufacturer's
labeled recommendations for paint viscos-
ity cup reading.
c. Using 50 lbs. air pressure at the gun,
spray two medium-wet coats of enamel
clear coat mixture. Allow first coat to set-
up for 15-20 minutes before applying the
second final coat. Allow to cure over-
night. Clean spray painting equipment
with lacquer thinner immediately after
use.
FULL PANEL PAINT REPAIR (FIGURE 2)
Basecoat
1. Wash with a mild detergent and water to remove
any water soluble contaminants, then clean with
a wax and grease removing solvent to remove
any tar, silicone or other road film not removed
with the detergent wash.
4.
5.
6.
Sand the complete panel(s) with #400 grit or
finer wet-or-dry sandpaper. Repair and feather-
edge damaged areas as required. Treat all bare
metal with recommended metal conditioner and
conversion coating. Follow manufacturer's
label directions.
Apply primer-surfacer to all bare metal areas.
Keep primer-surfacer within the damaged
area(s). Allow to dry 20-30 minutes before
sanding.
Using #400 grit or finer sandpaper, sand the
primer-surfacer to level the imperfection.
Reclean panel(s) with wax and grease removing
solvent and then tack wipe.
Apply one coat of an "adhesion promoter"over
the entire area(s) to be painted. Allow a mini-
mum of 30 minutes dry time.
The base color should be reduced 150-200%
with an extra-slow drying lacquer solvent. The
viscosity of the reduced base color is very
important in order to match the original finish.
The best way of checking the viscosity of a
reduced paint material is with a Zahn # 2 paint
viscosity cup or its equivalent. Temperature
influences viscosity directly. If a cold can of
paint is brought into an average temperature
room (65-70 degrees), it will be thicker and
more viscous. Adding solvent to make the paint
sprayable is not always the best action. The
paint should be allowed to reach workable or
average room temperatures. Follow manufac-
turer's recommended paint viscosity cup read-
ing for their specific material.
Apply two or three medium-wet coats of base
color.
Important
Apply only the number of coats necessary to
achieve full hiding.
Spray at 35-40 lbs. air pressure at the gun.
Allow each coat to flash approximately five
minutes before applying the final coat of base
color. Allow the final coat to dry for 20 minutes
before applying the clear coat.
If base coat must be sanded, proceed as follows:
a. Allow base color to dry.
b. Sand with ultra-fine wet-or-dry sandpaper
to remove the imperfection(s).
c. Reclean and tack wipe the area(s).
d. Apply one more additional coat of base
color.
e. Allow to dry 20 minutes before applying
the clear coat.