Master Airbrush model G22. When I depress the button, I should only be getting air until I pull back the trigger. Instead, my color is coming out as soon as I press the trigger. I have tried to clean the brush as best as I could, even removing the needle and cleaning it. What else should I do?

Try here

https://www.manualslib.com/

Do you have a water separator attached?

Solution too thick?low air pressure?

Hi!
Here's a very detailed guide for this airbrush. I'm sure you'll find your answer:
https://sites.google.com/site/donsairbrushtips/master-g22

Please take a look at this guide, it is detailed:
https://sites.google.com/site/donsairbrushtips/master-g22

i am not getting the paint to spray from the paint cup please help

It sounds like you have a dirty tip. It doesn't take much to stop the flow to the tip. You need to take the tip completely apart to give it a proper cleaning. Just soaking it won't do.
Hope this helps but if not let me know and I'll try and trouble shoot further.

Make sure the needle is pushed completely up against the tip. You will possibly have to take the back handle off to adjust it. (I am not familiar with this paint gun specifically). Make sure you do not force the needle into the tip, gentley push it until it stops.
I hope this helps.

First of all we must know how is works,that is air enters the brush causing a vacuum at the paint hose,where the hose is dip into the paint barrel,so paint will fill the vacuum where it will attend the brush,so if the air mechanism in the brush is glogged air will flow in the paint barell.Solution is to dismentle the brush and clean the air mechinism

Probably the paint and texture have clogged the orifice as well as the feed tube up. Hope the paint was water based. If so, set the gun down in a bucket of very hot water with the trigger tied open.

It may take several soaks. Each time you check it put the air on and pull the trigger a few times. Eventually it will unclog. By the way, you should take the orifice completely off so there is no restriction.

If it was solvent based you are pretty much out of luck.