Defects of coating

In places, semolina in the cured paint

If you encounter this problem after the powder coatings have cured, perform a step-by-step check of the technology parts mentioned below.

Compressed air

  • impurities in the compressed air
  • moist compressed air
  • insufficient air pressure in the system („gun spitting“)

Application equipment

  • impurities released from unmaintained equipment:
    • powder hoses
    • ejector blocks
    • powder coating guns
  • poorly adjusted fluidization of the powder paint:
    • too much air (sucks in air)
    • too little air (ejector block clogging up)

Paint (powder coating)

  • the powder is wet andclogs the transport routes
  • the powder is too fine andclogs the transport routes:
    • the recycled material content is too high
    • too fine from production
  • the powder is too fine, fluidization needs to be adjusted

Part and its hanging before entering the paint booth

  • impurities adhered to the product before painting:
    • insufficient surface pre-treatment
    • impurities in the drying oven

Curing oven

  • impurities from the oven
  • impurities released from the conveyor

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