Seeding, on the paint film surface, of small clots of the same color as the paint.
Q1: Has the pressure of the fluidizing air dropped?
A1:
A typical value is 0.03 MPa (typical range: 0.02 to 0.04 MPa), although it varies with supplier and air circuit configuration.
For example, it is necessary to raise the pressure setting if the circuit has a restrictor.
Check with the supplier as to conformance with the recommended value.
Q2: Has the particle size distribution of the paint changed?
A2:
Check the ratio of fresh powder to recovered powder.
Q3: Is the temperature or humidity of the fluidizing air or carrying air higher than appropriate?
A3:
Inspect the air dryer and oil filter. If faulty, repair the device(s) immediately.
Q4: Is there any paint buildup at the tip of the spray gun?
A4:
Clean the tip of the spray gun (with an air blow).