I found another estimate of airbrush consumption of .25 scfm, which is less than 1/4 of what I used before. That puts it back at about 30-40 minutes of continuous flow from a 68/3000. So about an hour from a 68/4500 with good fill. I imagine it will have a lot to do with paint thickness and your setup. Guys doing window painting seem to use some heavy paint and large coverage compared to small scale modelers, for example.
I put a 5 gallon tank on my little paasche compressor, so I have a very fat buffer that makes it hard to tell what my relative rate is.
Last edited by Spider!; 01-31-2013 at 12:32 PM.