Yeah, that black dust goes all over the place. Maybe you can pull her car out of the garage before you start and hang some painter's plastic to try and contain the dust.
I built a "paint booth" out of 4mil plastic and some 2x4s that I bolt together. I set it up in the driveway (The neighborhood HOA "snitch" always gives me **** for this) on top of some more plastic, don my spray gear and have at it. So far I've seen no evidence of escaping spray from the paint gun. When I'm done for the day, it breaks down in about 10 mins.
Maybe a similar setup would work for your polishing.
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