I definitely had to upgrade my compressor when I bought a North Coast Engineering grit blaster. Both capacity and flow are important variables.
I too typically grit blast at around 60 PSI, both with baking soda (currently) and AlO2, whether plastic, resin, or brass.
Note that grit can also lose it's ability to "cut" with age so it does need to be replaced occasionally. I just had to do that with my baking soda a couple of months ago.
From: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io> on behalf of steve_wintner via groups.io <steve_wintner@...>
Sent: Tuesday, November 30, 2021 7:20 PM
To: main@RealSTMFC.groups.io <main@RealSTMFC.groups.io>
Subject: [EXT] Re: [RealSTMFC] "Blaster"
Paul, which blaster are you using, and which grit ?