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Adhesion Loss, Plastic Parts

Description
Loss of adhesion of the refinish system and a plastic part substrate. This defect is often noticed some time after the painting took place.

 

 

Origin and Potential Causes:
  • Improper cleaning, drying(tempering) or preparation - failure to remove mold-release agents.
  • Improper treatment.
  • Wrong identification of substrate.
  • Failure to use proper sealer/primer.
  • Failure to use proper/recommended topcoat system.

 

Prevention Techniques:
  • Clean and degrease the plastic part properly.
  • Identify the type of plastic substrate and follow recommended paint system for that specific type of substrate.
  • Thoroughly clean substrate to be painted using recommended system.
  • Use recommended sealer/primer using the correct mixing ratio of recommended activator, flexible additive and thinner.
  • Apply sealer/primer to recommended film build using recommended viscosity.
  • Use topcoat as recommended for type of plastic substrate to be painted.
  • Where recommended, use a suitable adhesion primer for the type of plstic substrate being finished.

 

Remedy
  • Remove all finish layers from the substrate.
  • Refinish using recommended preparation and paint system for type of plastic substrate to be painted.

 
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