The CFM isn't really important for airbrushing.
Most modellers spray anywhere from 15-30 psi, so most any compressor should cover that. Is this a diaphram compressor or a piston model? The diaphram models tend to pulsate the airflow and will need a holding tank to even out the airflow.
Mike
“Wisdom is the right use of knowledge. To know is not
to be wise. Many men know a great deal, and are all the greater fools
for it. There is no fool so great a fool as a knowing fool. But to know
how to use knowledge is to have wisdom. " Charles Spurgeon