Use of anti-fogging coating on bino's

[Steve in Mi]

I was using my bino's the other day and hate having to hold my breath will galssing in the cold weather here in MI. Has any one used the Rain-X anti-fog stuff?? I e-mail Pentax ( makers of my 10x42) but they have not replied as if it would harm the lens coating. What do others do?? As you can you tell teh hunt was non-productive as I had plenty of time to ponder this. Thanks

[Len Backus]

I have used it and similar products. They work quite well and I can't imagine them harming the lens coating.