Hi!
I have not used it to remove dust but i have used it as a booster and looks increaser over the Werkstat Arylic, not the Nuba though. Over the Arylic you get all the bonuses 425 normally brings, some slickness, increased looks.
Personally, unless your using FK425 as a drying aid or as a quick step to add some shine when you dry then check out Sonus Arylic Sprits/Glanz its like Klasses SG in a spray and adds extra protection and looks!
Geoff