SHRINKAGE

Ringing, Edge Mapping, Bullseyes

The repaired area, featheredge, or sandscratches become visible within hours, days or weeks after the repair is completed.

CAUSE

• Topcoating before undercoats have thoroughly dried/cured.
  
• Undercoats applied excessively wet with inadequate flash time between coats.
  
• Undercoats under reduced.
  
• Using a poor grade and/or too fast evaporating thinner/reducer for spray conditions.
  
• Finishing over body filler that has not thoroughly cured.
  
• Using too strong solvent cleaner or using thinner/reducer as a surface cleaner.

REPAIR

Allow the affected area to thoroughly dry/cure, sand and refinish.

If additional filling is necessary, apply a primer surfacer, sand smooth and refinish.

PREVENTION

• Allow undercoats to thoroughly dry/cure before sanding and/or topcoating.
  
• Thin or reduce undercoats according to product label directions. Apply in thin wet coats allowing adequate flash time between coats to avoid "bridging" scratches.
  
• Select recommended thinner/reducer based on temperature, humidity, air movement, and size of repair.
  
• Follow body filler manufacturer's recommended cure time.
  
• Use solvent cleaner designated for either lacquer soluble or cured enamel/urethane insoluble substrate.

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