It’s not just a question of the reservoir; it’s about how much air the compressor can deliver continuously.
Unlike an impact wrench or a nail gun, which are only triggered intermittently, a buffer is run wide open for extended periods.
PJFransko, pneumatics are rarely used by detailers because they do require very large (and expensive) compressors to run them. The tools themselves are usually much more expensive than their electric counterparts too.
Still, if I had a fixed location and an unlimited budget, I’d love to go pneumatic.
Oh, and :welcome to Autopia.
PC.