Wurth is a pretty good product. Did you prep the wheels really well? How rough are the wheels? Any Pics? You may be able to wet sand them down lightly with 1500 grit and 2000 grit. After sanding them down try buffing Wizards turbo cut or Wizards Final cut. If it is not too bad you should be able to make them sparkle.
here is a link to Wizards, I have no affiliation just love what their products can do.....
http://www.innate.com/Supplies/Wizards/Wizards.htm