Drover, the poor warranty service I have had from Bushnell has been here in Australia, where Tasco does their warranty work. I have spoken to a few people here who have said forget about sending any sort of (Tasco or Bushnell) warranty work to Tasco in Australia. It might be different in USA.
Chuck Furniss, this fog zero looks like something to try. I dont know if I will put it on the lense of my Zeiss scopes or my new Swarovski Z6i. I will trial it on some of my lesser scopes, but would be interested to here from Zeiss or Swaro if they condemn or condone it on their coatings.