Polishing the satin finishes won't void the entire warranty, but I doubt you would be able to count on having finish issues covered. That being said, problems related to the finish are very, very rare. I think (and do not have any authority-I am supposing here) they would probably view the polishing as wear and tear, as it was the result of physical action outside the normal warranty anyway. As always, it might be best to call Customer Service and ask them first. 800 943-6782.