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3B-2 METAL REPAIR AND PAINTING
(b) Mix p r i m e r following
m a n u f a c t u r e r ' s
instructions.
(c) Apply primer and allow to air dry.
(d) Remove masking and wet sand repair area.
(e) If scratches or pin holes appear in surface,
apply glazing p u t t y according to
manufacturer's
instructions.
(f) After glazing putty dries, wet sand and
clean area. Apply final coat of primer and allow to air
dry.
(g) Wet sand and clean area with an after-sand-
ing cleaner.
(8) Mask area to be painted.
(9) Mix acrylic enamel color using a paint shaker
and following manufacturer's mixing instructions.
(10) Adjust air pressure at air regulator to obtain 40
psi at spray gun and spray test panel. Adjust gun to
obtain desired pattern.
(11) Apply one medium color coat to primed area and
allow paint to set up for 25 minutes.
(12) Apply two or more medium color coats. Overlap
edges of each coat to produce a tapered edge. Allow each
coat to flash completely.
(13) Adjust air pressure at air regulator to obtain 70
psi at spray gun and spray test panel. Adjust gun as
necessary to obtain desired pattern and color match.
(14) Spray one full wet color coat over entire repair
area. Overlap edges of previous coat.
(15) Empty gun and fill cup with enamel reducer.
Reduce air pressure at air regulator to obtain 20 psi at
spray gun.
(16) Spray blend-coat over edges of old and new
paint.
(17) Spray one or two medium coats over entire area.
(18) Remove all masking when paint has tacked up.
N O T E : If a haze appears over repair area after it has
dried, rub area lightly with liquid polishing compound.
FINISHING METAL REPLACEMENT PARTS
Metal body service replacement panels or assemblies
are painted with a black factory primer. For proper
adhesion of acrylic enamel color coats in service, the
following refinish steps are necessary.
(1) Wash part with paint finish cleaning solvent,
such as DuPont Prep-Sol, Ditzler Acryli-Clean, or
equivalent.
(2) Scuff sand part with 360 grade dry sandpaper.
Avoid cutting through and rewash part.
(3) Mix primer/sealer following
manufacturer's
instructions.
(4) Apply primer/sealer and allow to air dry.
(5) Wet sand smooth and clean with after sanding
cleaner.
(6) Apply acrylic enamel color coats as required.
Painting Tips
•
Use only one brand of refinish materials on each repair.
•
Follow manufacturing instruction for use of refinish materials.
©
Use recommended reducer according to shop temperature and
humidity conditions.
•
Mix paint thoroughly.
•
Spray a test panel and adjust gun to obtain desired color before
attempting to spray vehicle.
•
When matching colors:
— A given color can be darkened by:
1. decreasing air pressure
2. increasing fluid setting on gun
3. moving gun closer to surface
— A given color can be lightened by:
1. increasing air pressure
2. decreasing fluid setting on gun
3. moving gun farther f r o m surface
7 0 4 2 7
Metallic Color Guide
To Lighten a Metallic Color:
•
Use a Fast-Drying Thinner
•
A d d More Reducer
•
Raise Air-Pressure
•
A p p l y Dryer Coats
•
Wait Longer Between Coats
•
Mist Coat
•
Adjust Fluid Valve on Gun (Close)
•
Adjust Air Valve on Gun (Open)
•
Hold Gun Further From the Surface
To Darken a Metallic Color:
•
Use a Slow-Drying Thinner
•
Use Less Reducer than Normal
o
Lower Air-Pressure
•
A p p l y Wetter Coats
9
A l l o w Less Waiting Time Between Coats
e
Use Retarder in Paint
9
Open Fluid Adjustment on Gun
• "Close Air Adjustment on Gun
•
Hold Gun Closer t o the Surface
7 0 4 2 8
(7) If part is a replacement fender, perform addi-
tional following steps:
(a) Clean inside of replacement fender and al-
low to dry.
(b) Apply 1/8-inch thick film of spray under-
coating, using 3M Body Schutz Rubberized Coating (or
equivalent) and 3M Applicator Gun (or equivalent), or a
double coat of air-dry acrylic enamel to entire inside
surface of fender.
N O T E : Do not use aerosol spray
undercoating.
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