My powder coater has a big belt sander setup at an angle to the tube that rides on v-rollers so the tube spins and moves thru the v rolls. Very similar to a centerless grinder , it will put a powder friendly scuff on the surface. I need to stop and look at it to build one, you can pre-surface tubes before cutting to cut down on blasting later.
A company I used to work for has one. It's used on all of their tubing before fabrication since 90% of the parts are brushed aluminum.
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