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Mottling

Also known as: striping, banding, shadowing, flooding, floating, misting, precipitation, blooming, bloom, bleaching

 

Description
Occurs mainly in metallics, when the flakes float together to form a spotty or striped appearance.

 

 

 

Origin and Potential Causes:
  • Unsuitable thinner or reducer for application conditions.
  • Materials not uniformly mixed.
  • Spraying too wet.
  • Holding spray gun too close to work.
  • Uneven spray pattern.
  • Incorrect spray PSI or gun setup
  • Low shop temperature.
  • The flash time of the basecoat was too short before the clearcoat was applied.
  • Coat affected by wet or humid air/weather.

 

Prevention Techniques:
  • Select the thinner or reducer that is suitable for existing shop conditions and mix properly. In cold, damp weather, use a faster-dry solvent.
  • Stir all pigmented topcoats - especially metallics - thoroughly.
  • Use proper gun adjustments, techniques, and air pressure.
  • Keep your spray gun clean (especially the needle fluid tip and air cap) and in good working condition.
  • Do not spray metallic basecoats too wet.
  • Keep spray gun parallel to panel.
  • Follow application recommendations per the Technical Data Sheet

 

Remedy
  • Allow color coat to set-up and apply a drier double coat or two single coats, depending upon which topcoat you are applying.
  • If the defect is only visible after the application of the clear, thoroughly dry the clear, sand and refinish.

 
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