Corsica V6-191 3.1L (1990)
TO:
ALL CHEVROLET DEALERS
1987 thru early 1990 L cars produced at the Linden plant only, and painted medium sapphire blue, light sapphire, silver, or gun-metal gray, may be
subject to topcoat delamination after exposure to sunlight and humidity.
Use the following procedure to correct:
1.
Verify that the condition is delamination of the topcoat. Apply a piece of wide masking tape firmly over the suspect area, and pull upward quickly.
If the topcoat and clear coat flake or peel off the primer, leaving the primer intact, the topcoat is delaminating.
2.
Refinish all the horizontal surfaces, including the hood, deck lid, and roof. It is important that all horizontal surfaces be refinished, as other
horizontal surfaces may show the same condition at a later time, causing customer comebacks.
3.
Standard refinish techniques should be used. The clearcoat and colorcoat should be removed, but the primer should be left intact.
Labor Operation Number:
T1563
Labor Time:
5.8 hrs.
Technical Service Bulletin # 331708
Date: 931101
Paint - Clearcoat Degradation, Chalking and Whitening
Group Ref.: Body
Bulletin No.: 331708
Date: November, 1993
SUBJECT:
CLEARCOAT DEGRADATION - CHALKING AND WHITENING
MODELS:
PASSENGER CARS WITH BASECOAT/CLEARCOAT
CONDITION:
The vehicle exterior surface may show large chalky or white patches in the clearcoat, usually but not limited to the horizontal surfaces.
Blacks, Dark Blues, Reds, may have potential for this condition. On rare occasions, other colors may be involved.
CAUSE:
The clearcoat (with sunlight and heat) may degrade and turn white or chalky.
IDENTIFICATION:
On a clean surface, at or above room temperature, firmly apply a 2" wide piece of masking tape to the chalky or white area of the clearcoat and pull
upward quickly. The adhesive side of the tape WILL NOT HAVE THE PAINT COLOR ON IT. A light shine or reduced tackiness may be noticed on
the tape adhesive surface, indicating clearcoat transfer to the tape.
CORRECTION:
Refinish all horizontal surfaces using the following procedure.
-
Remove the clearcoat layer from all horizontal surfaces and the top surfaces of fenders and quarter panels.
NOTE:
In some cases, it will be necessary to remove the clearcoat from the upper vertical surfaces of fenders, doors and quarters (approximately 3"), and the
top areas directly above the front and rear wheelhouse openings.
-
Lightly sand any previously exposed base color to remove any chalky residue from the surface.
-
The vertical surfaces should be sanded and colorcoated to the next lower breakline (typically the body side moldings) for color uniformity of the
repair.
IMPORTANT:
