G 30 1 Ton Van L6-250 4.1L VIN D 2-bbl (1983)
Technical Service Bulletin # 8559
Date: 850301
Paint - Basecoat/Clearcoat Repair Systems
Number:
85-59
Section:
10
Date:
MAR., 1985
Subject:
BASECOAT/CLEARCOAT REPAIR SYSTEMS
Model and Year: ALL
TO:
ALL CHEVROLET DEALERS
The repair systems contained in this bulletin are recommended as a guide when repairing basecoat/clearcoat exterior finishes on the
above.
The following procedures outline a method for making spot/partial and full panel repairs on nonflexible parts and full panel repairs on
flexible parts.
Nonflexible Panel Repair System
Basecoat - Lacquer or Enamel
1.
Wash with a mild detergent and water to remove any water soluble contaminates, then clean with 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. Allow to dry thoroughly and apply
primer-surfacer to repair area. 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 sandpaper or hand compound (follow manufactures recommendations).
5.
Reclean panel(s) with wax and grease removing solvent and then tack wipe.
6.
Apply one or two coats of adhesion promoter within moldings and/or breaklines of the panel section(s) to be refinished. When making paint
repairs to areas such as quarter panels where the repair is not confined within moldings or breaklines, apply adhesion promoter a minimum of 4-6"
onto adjacent panel. Adhesion promoter must extend beyond the area to be covered by the clear coat when not confined by moldings. Allow to
flash a minimum of 30 minutes before applying base color coat. Some enamel basecoat may not require adhesion promoter. Follow manufacturer's
recommendations.
7A. Polyurethane Enamel Basecoat
CAUTION: There are a number of paint systems available for service use: however, many require additives containing isocyanates. It is essential that
all recommendations and warnings listed on the container label for materials selected be followed.
It is mandatory that adequate respiratory protection be worn. Examples of such protection are: 3M models #6984 and #6986 disposable
respirators.
Such protection should be worn 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, activitate the Polyurethane Enamel material. Mix material thoroughly. Pot life of activated mixture
is approximately eight (8) hours.
b.
Reduce basecoat per label directions. Some activated Polyurethane Enamel 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 specified enamel reducer may be added to the activated mixture. Check
the viscosity of the activated mixture with a Zahn #2 Paint Viscosity Cup or its equivalent. Follow the paint manufacturer's labeled
recommendations for paint viscosity cup reading, c. Using manufactures specified air pressure at the gun, spray two medium-wet coats of enamel
mixture to achieve full hiding. Allow first coat to set-up for 15-20 minutes before applying the second final coat. Unless manufacturer recommends
otherwise allow to cure overnight.
7B. Lacquer Basecoat
a.
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 OEM (original equipment manufacturers) finish. The best way of checking the viscosity of a reduced paint material is the a Zahn
#2 paint viscosity cup or equivalent. 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 the best action. The paint should be allowed to reach workable, or average
room temperatures. Follow manufacturer's recommended paint viscosity cup reading for their material.
