Hello everyone,
I thought, I could speed up some projects with  the Cup gun, because it looked easy to clean.
Well, it certainly is, for a spray gun.
But I can't get it working properly. the spray pattern is really, really bad, no matter what I do. And the output is very limited. Additionally, the spray cone is far to wide, i am literally spraying half of my workshop.
First, I thought the polyester gelcoat might be to thick, so I thinned it slowly with compatible polyester resin. Basically with unthicked gelcoat. Still, only "drop throwing". In the very end, it was so liquid, it ran off the nozzle with or without air pressure.
Then I thought a different product might work better. So I took the only thing I got from Ec that was listed in the description of the gun, pattern coat primer. Same result.
Pressure was right, although I played with it later, without getting better results. temperature was 20°C. I checked every connection and every bore of the gun. Everything seemes to be as intended.