The trouble with Max's paint select is that even if you have "Ignore Backfacing" checked, it still likes to select backfacing verts. This is also evident in Selecting by Angle. I remember that Orion Flame had a nice paint selection tool. I am wondering if there is a paint selection script to get precise painting with real "Ignore Backfacing".
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This is the most annoying thing in Max and it's not going to be fixed. Most users got used to that atrocious selection because they never tried other software witn proper selection tools.
BTW, Ignore Backfacing is working as it should, Max needs camera based/raycast selection.