Hi there. I am brand new to airbrushing and got a chance to use it for a few hours last weekend. It is a dual action Iwata Revolution HP-CR. When spraying do you always press all the way down on the air and then use the pulling back motion to control the paint flow? Or are there times where you are only slightly pressing down for air while pulling back? I am still trying to get a feel for thinning the paint too. If you are using thinner paint do you want a lower PSI? If I remember correctly I was around 22-23 PSI.