I had this problem.
Two things that I messed up the first couple of times I used it.:
1. You need to make sure the brass nozzle/cap is fully inserted into the opening. It takes a bit of a push. If you don't do this, the gel will drip out and under the atomizer.
2. Make sure there's no bits in the mixture. You can't filter it, but you pretty much have to use a new cup every time, otherwise bits will chip off the sides of the cup and block the nozzle. No the end of the world though. Place the gun down on a flat surface with the nozzle facing up, pop the cap out and unscrew the nozzle. If you cant see through it, its blocked, just bang it on a table and you'll probably see a bit of hardened resin fall out.
Also be careful when you re-screw the nozzle back in the cap. The thread on the nozzle is a bit soft, I've had to file it down a couple of times.
I use it at 80 psi, and adjust the fluid on the spot depending on how it sprays. Its not like an HVLP where half a turn makes a big difference. Its a bit more redneck than than, slap and go.
