The lower PSI is what I have heard over the years (by a couple body shop guys and thousands of calls; just sharing). Like the anti-spatter spray was one person.

We still recommend 65PSI for the PP50, bump to 70 or 75 as you get thicker and it will work fine. Again it depends on the speed you move and I'll repeat. With the right compressor (CFM and PSI), dry air is the big secret for plasma I have found.