• Excessive coat thickness of basecoat
• Intermediate and final flash-off times of the basecoat too short
• Wrong mixing ratio of clearcoat/ hardener
• Incorrect hardener/thinner combination; system too fast
• Apply basecoat film thickness according to technical data sheet
• Use the intermediate and final flash off times from the technical data sheet
• Choose and mix clearcoat, hardener and thinner according to technical data sheets
• Sand and repaint