Pontiac Fiero 1988 Service Manual page 133

2C-2 BODY PANEL REPAIR
• Wax, grease and silicone removing
solvent
• Cloth back body tape
• A supply of 6" #180 grit sanding discs
• A supply of 6" #320 grit sanding discs
• A supply of 3" #50 grit sanding discs
• Random Orbit Sander with a 6" backing
pad
• A 1/4" or 3/8" drill motor with a 3" disc
holder
• Hand sanding block
• Rubber squeegees
• #220 grit sandpaper
• A non-porous mixing palette
® A wood paddle or putty knife
• A curved tooth body file
• 3M #05900 — Flexible parts repair mate-
rial or equivalent
PAINT REPAIR
Listed below are repair procedures to the
basecoat/clearcoat paint system, for full panel or par-
tial (spot) repairs, and for flexible and non-flexible
panels.
NON-FLEXIBLE PANEL PAINT REPAIR
Non-flexible panels are the hood, tear deck lid,
roof, and headlamps covers.
PARTIAL (SPOT) REPAIR (FIGURE 1)
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.
2. Repair and featheredge damaged area(s) as
required.
3. If substrate is metal, treat surface with a metal
conditioner and conversion coating according to
label directions and allow to dry thoroughly.
Apply primer-surfacer to repair and featheredge
damaged area(s) as required. Allow to dry 20-30
minutes before sanding.
4. Using wet or dry #400 grit sandpaper or finer,
sand entire area(s) to be refinished with the
basecoat color. Areas to be clear coated only,
should be wet sanded with #600 or finer sand-
paper.
5. Reclean panel(s) with wax and grease removing
solvent and then tack wipe.
6. Apply one or two coats of an "adhesion pro-
moter" over and 6-8" beyond the area(s) to be
refinished. Allow to flash a minimum of 30
minutes before applying base color coat.
7. Reduce base color 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 mate-
rial is with a Zahn # 2 paint viscosity cup or its
equivalent. The temperature influences viscos-
ity 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 sol-
vent to make the paint sprayable is not always
the best action. The paint should be allowed to
reach workable, or average, room temperatures.
Follow manufacturer's recommended paint vis-
cosity cup reading for their material.
8. Spray base color at 35-45 lbs. air pressure at the
gun. Apply only the number of coats needed to
get full hiding. This will require two or three
medium-wet coats. Allow each coat to flash
approximately five minutes and spray each coat
slightly wider than the previously applied coat.
A premixed mist coat of clear acrylic paint
material may be used if desired to melt
overspray into the base color. Allow to dry for
20 minutes before applying clear coat. Do not
sand base color coat unless it is necessary.
9. If basecoat 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 repair area(s).
d. Apply an additional coat of base color.
e. Allow to dry 20 minutes before applying
the clear coat.
Clearcoat
1. Lacquer Clearcoat
a. Reduce clearcoat 125-150% with an
extra-slow drying lacquer thinner to the
recommended paint viscosity cup reading
of the paint manufacturer.
b. Spray at least two medium-wet coats of
clear at 35-40 lbs. air pressure at the gun.
More may be desired. Spray first coat
beyond base color coat and allow to flash
for approximately 5-10 minutes. Spray
each additional coat of clear slightly
beyond the previously applied clearcoat.
Allow flash time between coats. After the
final coat of clear is applied, apply a mist-
coat (clear acrylic and thinner) to melt in
overspray. Stay within the applied "adhe-
sion promoter" with all spray operations.
Allow the repair to dry overnight, then
rub out with a light-cutting hand or
machine polishing compound.
2. Enamel Clearcoat