Wanted to give you another example, as I was thinking of this thread.
There's lots of new spots on my car overnight from a pear tree that won't easily wipe off, even with UWWA. Yet, as I'm wiping them mostly away, I can tell that my DA-applied wax is gone, D301 (yet the paint is protected with so much UWWA and GCQW). I can tell because of a subtle change from a bluish dark black to a silvery glossy black. When I was using Gold Class, it was from a golden glossy black to a silvery glossy black. So, one of these days soon when it's hopefully not 110 degrees I'll use D301, a cleaner-wax, to do a quick (but sweaty) monthly re-wax, and any spots like that, as well as new swirls and other minor scuffs, will be gone. This is partly because there are plenty of polishing oils underneath from all the correction work I've done this year.
While I do recommend a Porter Cable over the drill-powered setup, once you get a DA solution going, you will find minor spots like that to be no real issue, but do test spots and allow yourself time to get used to the gear. It's scratches, rock chips, and other defects that will be more challenging

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