1. High moisture in spraying area
2. Using the Thinner which dries too fast
3. Air pump delivers too high air pressure
1. If the work area is high in moisture, use a slow-drying Thinner to delay the vaporisation of the Thinner.
2. Warm up the work surface
3. Use appropriate air pressure
1. For few blushing, sand them out with mark remover.
2. In extreme cases, sand them out with Sanding Paper no. 1500-2000, and re-do the top coat.