I know you are concerned with cfm requirements but there are guns out
there that only use 5 or 6 cfm and have nozzle pressure of 21 psi. they
have pressurized cups and tanks and cost less then 500.00 bucks

I made a mistake it is 21 psi at the gun inlet and 10 at the nozzle
Donald Grudeski
President Brush Boy Painting Company