you will get dust no matter what
i use jetseal and countless coats of dodo juice PH, im on a flat black car and dust is a issue no matter what, one thing i wouldnt do is wipe it off as all you will do is damage your finish.. patience is the key and a good wash method is a must on a black car.
i wash mine every week, the sealants help to a extent but bottom line is, dust is dust and it will land on anything similar to the attraction flies have to sh!t