As a Soundsmith owner, (2 actually), Peter L came out warning of the use of Onzow, which I was using, but does highly recommend the much cheaper BluTack solution. Thus, I know have BluTack stuck to my Onzow case, and that is what I now use.
Anyone Still Using Zerodust
Haven’t heard anything since the original scare, but I stopped using it. I think I never had a problem because I always swipe with LP#9 between sides, as per Brooks Berdan’s advice. One recent video said Wally discovered some type of oil on the ZD. I regularly cleaned mine with dishwashing liquid, which could have removed any residue.