Doesn’t help with the fog from a mask.
Difficult to apply and even more difficult to clean off. Both I was totally okay with and spent about 20-25 minutes on three pair of glasses. Yes I am very particular with my glasses being clean so maybe some of that time is on me, but it was like getting wax out of your sore handles on your car. Once I got all my glasses done I went into a store with my mask on and.  Ffffffoooogggggyyyy!  I remember seeing this stuff at a outdoor show years ago and that’s why I purchased.
Rating: 2 stars