Hi Alex,

I have been using a similar product "Rain Away" windscreen rain repellent, of which I was fortunate enough to get a sample of from the Airforce on my system 4 visor.
Works pretty good but would not recommend using this or any similar product on the inside of your visor due to the anti fog coating.
I have used "plex"in the past and found that to be ok too on the outside of the visor.

Hi Alex. Rain-X is great and quite cost effective if used correctly, but only on the outside of the visor. Of course you need more in Auckland!!

No worries Alex. Once you’re South of the Bombays your chance of rain should be much slimmer and you shouldn’t have to play that guessing game for too long. Not entirely sure if we’re making it to the rally. If you’re passing by our way (and of course you’d try Vinegar Hill then come down the Eastern flank and take on the Rimutaka Hill road just for fun) do drop in for beverage and a chat, we’ve spare room if you need it. Merry Christmas, all the best for a happy, safe and prosperous New Year.

All the best.

I use it on the car and it’s great. I tried a little on my Shoei visor and it started to craze the plastic so dont use it.
Andy King, of 18x Rusty 1000 miler fame said that a very fine spray of 100:1 dishwashing liquid / water works. Next year he will rig a windscreen washer pump and reservoir, aimed at his visor from the top of the screen......

Most Caltex service stations sell Rain-X. Repco, Super Cheap and those other auto accessory outlets all have it down here.

I’ll second Pledge. Our whanau have all used it for a very long time, not least because it tends to fill in the microscopic imperfections that your visor inevitably collects with use, so you get less dazzle at night. Waterrepellent properties are good: turn your head a wee bit, rain slides off.
The downside? Bugs stick to it. Got a hell buildup of Ellesmere midges earlier this year - little buggahs slid off the blade of the R1100S, shone with the same can of Pledge (angle of attack involved there?), and all collected on me visor.
Ah well, ya can tell a happy motorcyclist by the bugs between his teeth.
Merry Christmas to all, keepya shiny sides up, enjoy ya travels.

😀 I’ll third the use of good old Pledge. You can clean the whole outside of the helmet at the same time as waterproofing the outside of the visor. It used to come in liquid form which was good for carrying a small bottle for use on a run but haven’t seen it in anything but aerosol for some time.

Malcolm