Toddgoesfast
+1y
its most likely oil from the compressor pump in the air coming thru the hose. your hose is probably contaminated now as well.
my suggestion is to get a new hose, a better filter (before the hose) then use another small filter on the end of the gun.
clean and color sand the vehicle and reshoot it. single stage will smooth out the more you color sand it. Id use a rubber block and wet sand it with 600 or 800 depending on the type of paint it is.
ask your paint rep.
dont use fish eye ban or fish eye eliminator, it does the things mentioned above plus it dulls the paint.