Checking or Crazing of Film

Checking or Crazing of Film

When the coating carries excessive weight, cracks and checks result in the film, while aging, in the first twelve months. This defect type is Checking or Crazing of Film. It is not usually associated with nitrocellulose lacquers but is critical when acid catalyzed products like pre-catalyzed lacquers and catalyzed varnishes are used.

Possible Causes

Solutions

Applying Heavy Layers of Coats • Apply only sufficient material to complete full covering.
• Do not exceed a total thickness of 4 dry mils.
Mud cracking • Occurs when latex is applied in excess, film thickness or drying quickly, after application.
• Reduce application thickness to balance it.

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