HVLP?

Whats the compressor rating for a HVLP gun to do serious work? I see the HF turbine HVLP gun. looks like a Wagner power painter with a vacuum hose on it. Does that even work? Its just that its included turbine compressor would save you some coin if you didn't have a 30 gallon 12CFM compressor. I already have a HF gun and a 20 gallon Craftsman compressor, maybe 6 CFM?