water droplet repellant

does anyone know a way to keep water from beading up on underwater housing for a video camera?? my friend has tried rain-x but it washes off in the salt water. we don't need anti-fogging stuff-just some kind of repellant that will withstand the elements of salty waves and wakes.

There is a product called Brillianize. You should be able to find it at Home Depot or Lowes. If not, check with a company that sells plastic sheeting and supplies. Laird Plastics in Seattle is one of them in the NW. It is considered a plastic cleaner and polisher but it makes plastic slicker than $hi#. I spilled some on my linoleum floor and could have played hockey on it. I'm not sure how it will hold up to salt water but it might be worth a try. It comes in spray bottles and 1 gallon jugs.

Hope this helps.

I have been told that SALIVA works best....

It's free

Actually I tried the saliva thing and ended up with funky smears in my pictures. I think I may have used too much spit though...hmmm. I put some Rain-X on the lens which makes the water bead up, then I just blow hard on it and the droplets run off. What you are probably running into with salt water is the droplets drying on the lens and causing water spots. What you may want to do is get a cheap car window squeegee thing and cut it to match the width of the port. Then you can just wipe off the drops. Attach the squeegee to your vest with a strap and you are good to go. A photographer and videograper that I have seen use that method.
Hope that helps you some.
Tiff