When I was at SEMA last Fall, I talked with several abrasive manufacturers, they all had products like this, little ~ 2 inch, high grit discs
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I got to talking to one rep and asked him why these were so prevalent. He said the major auto manufacturers were the main customer.
He went on to say that Honda and Toyota use them a lot. They get between 25-40 nib's per car and use these little discs on a 90 degree mini sanding tool to cut them out and then buff the spot with a mini polishing pad.
I have to imagine that the paint booths being used by Honda and Toyota are about the absolute best available.
And yet, they get dust.
I think the consistent advice we've heard here is all we really need:
-Get the car really, really clean
-Wear a paint suit
-Blow down the area and let it settle - a long time
-Have some reasonable airflow to get the overspray out
-Keep it simple
-Plan on cutting and buffing it you want it really nice