SPI white epoxy or any other brand I have used should spray like a dream with just about any spray gun with a 1.4 to 1.7mm fluid tip and a moderate sized air cap. HVLP or RP. I doubt it is your product. I sprayed some last summer with 4 year old activator and it was fine.
What you show could well be a lack of adequate air flow in cfm--check at your hose output with an anemometer. What is your RTS viscosity?
What you show could well be a lack of adequate air flow in cfm--check at your hose output with an anemometer. What is your RTS viscosity?