GM Service Manual Online
For 1990-2009 cars only

Notice:  Removing more than 0.5 mils of the clearcoat can result in early paint failure. The clearcoat contains ultraviolet screeners. Do not finesse sand more than what is required to remove the defect.

  1. Select small test area on damaged panel.
  2. Wet sand damaged area with an American grade ultra-fine sandpaper of 1,500 to 2,000 grit and rubber sponge sanding block. During wet sand process:
  3. 2.1. Use ample amounts of water.
    2.2. Go slow to prevent removing too much clearcoat.
  4. Be sure to use American sandpaper. European sandpaper has a P before the grit number and European grits do not align with American grits the majority of the time.
  5. Remove excess water with rubber squeegee and inspect area.
  6. If wet sanding has repaired the damage, continue the sanding procedure on the entire panel.

  7. Apply a finesse-type polish with a foam pad and remove any swirl marks with a dual action orbital polisher and foam pad.
  8. If (during the repair) it is suspected or observed that etching has penetrated into the basecoat, too much clearcoat has been removed during sanding or base color is transferred to pad during polishing, the affected areas may require clearcoat/basecoat application or refinishing. Refer to Flexible Plastic Part Refinishing or Rigid Plastic Part Refinishing

  9. Polish entire vehicle after all damage has been repaired.