Refinish application defects

Blisters

Blisters visible under the surface varnish coating

Blisters

Cause

  • Lack of insulation of polyester materials
  • Water condensation when temperature change
  • Polluted installation of compressed air
  • Hygroscopy of the substrate (wet on wet sanding)

Countermeasure

  • Dry sanding
  • Use correct filters for compressed air
  • Seclude polyester materials
  • Avoid damp spaces

Removal

  • Dry sanding
  • Use correct filters for compressed air
  • Isolate polyester materials
  • Avoid damp spaces


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