PROBLEM
Poor UV adhesion (flaking, crawling or scratching).
CAUSE
  • Proper primer not used.
  • Waxes in inks.
  • Water entrapment.
  • Trapped ink oils or solvents.
  • UV crawling (not wetting properly).
SOLUTION
  • Use qualified primer coating only.
  • Use wax free inks.
  • Use glycol-free etch.
  • Allow additional drying time prior to UV coating.
  • Use low VOC or high solid inks.
  • Avoid excessive use of open-time, spray or additives.
  • Consult UV supplier for wetting agent, flow aid, or different UV coating formulation.
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