1996 Chevrolet Astro Owner's Manual - Page 263

Finish Damage Any stone chips, fractures or deep scratches the finish should be repaired in right away. Bare metal will corrode quickly and may develop into a major repair expense. Minor chips and scratches can be repaired with touch-up materials available from your dealer or other service outlets. Larger areasof finish damagecan be corrected in your dealer's body and paint shop. Underbody Maintenance Chemicals used for ice and snow removal and dust control can collect on the underbody. If these are not removed, accelerated corrosion(rust) can occur on the underbody parts such as fuel lines, frame, floor pan, and exhaust system even though they have corrosion protection. At least every spring, flush these materials from the underbody with plain water. Clean any areas where mud and other debriscan collect. Dirt packed in closed areasof the frame should be loosened before being flushed. Your dealer oran underbody vehicle washing system can do this for you. Chemical PaintSpotting Some weather and atmospheric conditionscan create a chemical fallout. Airborne pollutants can fall upon and attack painted surfaces on your vehicle. This damage can take two forms: blotchy, ringlet-shaped discolorations, and small irregular dark spots etched into the paint surface. Although no defect in the paint job causes this, GM will repair, at no charge to the owner, the surfaces of new vehicles damaged by this falloutcondition within 12 months or 12,000 miles (20 000 km) of purchase, whichever comes first. 6-55