So far it not really collecting any dust in my area ! Nothing so far anyway .. on the mirrors and treated exterior places I used it ,,, it gets nothing more that normal dust or pollen that just wipes off ,, heck I could use a feather duster and take care of any dust .. probably less than dusting a glass table once a week in your house .. as for how long it last and needs to be reapplied.. unknown but still looks like it did when done applying and it’s been rained on several times .
But like with any thing test small areas ,, like a mirror to see what happens in your area and those Cali dust storms hahaha