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Peeling

Also known as: loss of adhesion, shelling, poor bond, delamination, flaking, poor adhesion

 

Description
Loss of adhesion between paint and substrate - topcoat to primer and/or old finish, or primer to substrate.

 

 

Origin and Potential Causes:
  • Improper cleaning or preparation. Failure to remove sanding dust and other surface contaminants will stop the finish coat from coming into proper contact with the substrate.
  • Improper metal treatment. Metal conditioner and/or wash primer was not used.
  • Use of incompatible material for substrate.
  • Materials not uniformly mixed.
  • Failure to use proper sealer.
  • Paint film too thick.
  • Dry application.
  • Film was too dry when the masking tape was removed.
  • Flash times too short.
  • Poor sanding of substrate or undercoats.
  • Too low/too high surface temperature when applying refinish system.
  • Condensation on substrate due to temperature changes.

 

Prevention Techniques:
  • Use appropriate grits of sanding material for the system you are using.
  • Seal to eliminate sandscratch swelling. Select thinner or reducer suitable for existing shop conditions.
  • Use proper thinner and reducer for primer-surfacer.
  • Do not apply coats of primer too heavily.
  • Use compatible paint systems.
  • Degrease and prepare substrate carefully.
  • Follow application recommendations per Technical Data Sheets.

 

Remedy
Remove finish from an area slightly larger than the affected area and refinish.

 
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