REMOVAL OF CHEMICAL SPOTTING AND MINOR PAINT IMPERFECTIONS

Model and Year: ALL MODELS WITH BASECOAT/CLEARCOAT PAINT

This bulletin cancels and supersedes Chevrolet Dealer Service Bulletin 87-166 (Section 10) dated June 1987. This bulletin provides new materials which are available for use on basecoat/clearcoat systems.

Some Chevrolet models equipped with basecoat/clearcoat paint applications may experience a condition of small etched spots on horizontal surfaces of the paint finish. This condition is referred to as chemical spotting and may be caused by industrial fallout (acid rain).

Chemical spotting along with other minor paint imperfections on basecoat/clearcoat finishes, such as sand scratches, dirt in paint, sags and orange peel may be repaired without paint application. Examples of these imperfections are shown in Figure 1.

To repair these conditions use the following procedures:

1. Wash the subject panel with water to remove any foreign material such as dirt, grit, etc.

2. Wet sand subject panel with 3M Micro fine 1500 grit sandpaper, P/N 2023 or equivalent. Wrap the sandpaper around a 3M rubber sponge back up pad, P/N 5530, to prevent leaving finger marks in the clearcoat. NOTE: Always sand the length of the panel and use a mild dish soap detergent in the wet sand operation for sandpaper lubricant.

3. Wheel compound sanded panel with 3M Finesse it II, P/N 5928, polishing compound and 3M Super Buff Polishing Pad, P/N 5705 or equivalent.

4. Swirl marks, left in the clearcoat, can be removed by rebuffing the affected area with a non-directional, dual action (D.A.) orbital sander. A clean terry cloth polishing bonnet and 3M Finesse II compound should be used.

CAUTION:

Buffing wheels are not recommended for routine new car pre delivery preparation of basecoat/ clearcoat finishes.

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.

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.