AERO-WING SPOILER (D-81) NEW- PART/REVISED PAINT PROCEDURE

Models Affected: 1989 FIREBIRD MODELS

This bulletin cancels and replaces 89-10-8 published 2189. This bulletin has been revised to change the source name and telephone number for the recommended material.

1989 Pontiac Firebird models (beginning with VIN KL211199) that include D-81 option "Aero-Wing" spoiler have a new paint process used on that specific spoiler. The process used is a two part prime, base and clear coat system.

The new spoiler, GM P/N 12397143 is available through GMSPO and will come pre-primed.

Parts are currently available from GMSPO.

The material recommended is from AKZO Coatings Inc. AT-331 Base Coat/AT361 Clear Coat.

Contact: Customer Service Dept. AKZO Coatings Inc. P.O. 7062 Troy, MI. 48007-7062 313-637-0400

Color WA # ------ ---- Moly Blue WA 9537 Flame Red WA 8748 Gun Metal WA 9536 White WA 8554 Black WA 8555 Red WA 8774 Bright Blue WA 9591

"We believe this source and their equipment to be reliable. There may be additional manufacturers of such equipment. General Motors does not endorse, indicate any preference for or assume any responsibility for the products or equipment from these firms or for any such items which may be available from other sources."

REPAIR PROCEDURE FOR AT-331/AT-361 FLEXIBLE BASECOAT/CLEARCOAT

Primer Surface Preparation:

Sand primer surface using 400 grit or finer sandpaper. Remove sanding dust by wiping with solvent (toluene or equivalent).

Basecoats:

----------- Agitate AT-331 basecoat for 1-2 minutes on paint shaker.

Activate basecoat with urethane hardener as follows:

Metallic Colors: Mix 10 parts basecoat with 1 part 10AHU-41421 urethane hardener; stir thoroughly. Reduce to spray viscosity with 2-3 parts 10 AHK-43286 solvent blend if ambient temperature is 70-85 degrees Fahrenheit or, 2-3 parts 10 AHK-42550 solvent blend if ambient temperature is 80-95 degrees Fahrenheit.

Solid Colors: Mix 4 parts basecoat with 1 part 10AHU-41421 urethane hardener; stir thoroughly. Reduce to spray viscosity with 1-2 parts 10AHK-43286 solvent blend if ambient temperature is 70-85 degrees Fahrenheit or, 1-2 parts 10AHK-42550 solvent blend if ambient temperature is 80-95 degrees Fahrenheit.

Basecoat pot-life is 4 hours.

Apply basecoat using 60-70 psi atomizing air in two coats allowing 1-3 minutes flash-off between coats. Allow basecoat to flash for 3-5 minutes before applying clearcoat.

Clearcoats:

------------ Stir AT-361 clearcoat for 1-2 minutes.

Activate clearcoat with urethane hardener as follows:

Mix 5 parts clearcoat with 1 part 1OBHU-41421 urethane hardener; stir thoroughly. Reduce to spray viscosity with 1-2 parts 10AHK-43286 solvent blend if ambient temperature is 70-85 degrees Fahrenheit or, 1-2 parts 10AHK-42550 solvent blend if ambient temperature is 80-95 degrees Fahrenheit.

Clearcoat pot-life is 4 hours.

Apply clearcoat using 60-70 psi atomizing air in 2-3 coats allowing 1-3 minutes flash-off between coats. Allow 10-15 minutes flash before force drying.

Force Dry: 60 minutes @ 140 degrees Fahrenheit

Cleanup: Clean spray guns and equipment immediately with solvent (xylene, toluene or equivalent).

Use applicable labor operation and time.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.