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I've used a duster for years - actually the same duster - with great results. I use it every day as long as the car just has dust on it and if I miss a day I usually will stop and not start again until after the next wash. If you use it long enough there will eventually be a little build up of the paraffin residue on the car which can easily be removed with spray detailer or it is probably just time for a car wash anyway. My car is garaged most of the time and with daily dusting I can go for a month or more between washings. As I said I've used a duster for years and have never seen any kind of marks on the finish.
I used it on my black car, works great and doesn't leave mark. Although when it's new it leaves little "wax" lines that was on the duster but is easily removed using microfiber towel.