If you use a desiccant, you must use an after filter to remove any desiccant particles. (for painting) So the set up would be regulator-filter-desiccant-after filter. I would agree that the limit is the tank to maintain the correct pressure/scfm. You are probably also correct at 10scfm at 25 psi. I just re-read your original post and I mis-read it the first time. I thought you would have 10 scfm at 40 psi not 8.6. I need to drag my paint gun out and read the specs for you.
Darren
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