Slack said...
Rainx on sunnies? I thought you could only use that product on glass, I have some Rainx but have been reluctant to try it on my sunnies.
Will it damage them? I know Rainx works, I used it all the time on the boat windscreen.
The Rainx water repellent won't hurt your glasses. However, it has the reverse effect of the anti-fog stuff and causes vapour to condense in little beads. If you have close fitting sunnies without a lot of circulation and you put Rainx on the inside of your lenses they will fog up when you sweat.