Colored spots / impurities in the coating

Compressed air

• moist compressed air
• impurities in the compressed air
• oil in the compressed air

Application equipment

• impurities released from poorly maintained equipment
  • powder hoses
  • ejector blocks
  • powder coating guns

Paint (powder coating)

• impurities introduced in the powder coating:
  • while handling the powder coating
  • from the equipment during powder coating recycling
• manufacturing defect of powder coating

Part and its hanging before entering the paint booth

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

Curing oven

• impurities from the oven
• impurities released from the conveyor