Compressors and PSI

Generally not more than 30 PSI. Mostly 15-25.

Welcome to the forums/ Good to have you here.

bbaerst is correct. You don't need much pressure if all you are going to paint is models. Probably 90% of my painting is at 15 psi or less. I have a general purpose compressor (as opposed to a hobby compressor used primarily for airbrushes) and will occasionally run it up to about 40 or so to clean out my airbrush, but it isn't really necessary.

yep, you dont need anything above 50 unless you're doing some hardcore industrial painting, or t shirts for tshirhell.com

I agree with everyone else.
The only advantage to having more available air pressure is that you can crank the pressure up to 50-60 psi or more while spraying out the airbrush to clean it better. Other than that it is not necessary. I spray between 10-25 psi normally.
The higher the pressure the better the paint atomization, but the less control of overspray you have.

Mike