TLDR version: Buy the kit. It works. It's good for at least a month, if you clean it with microfiber every time. You can even apply it to dirty lenses, provided it's "normal" dirt and not anything with minerals/deposits in it. (Just in case you mountain bike.)
Originally Posted by SeaBee
I've been getting conflicting opinions - maybe you guys with more experience on these eyewear will be able to clarify something for me. Is the hydrophobic coating on the Oakley lenses (Radars, in my case) permanent or not? Do you need the hydrophobic kit to "refresh" the layers every now and again, in other words.
And if it's not permanent - how long does it last before it needs refreshing? What causes it to shorten it's lifespan?
The hydrophobic coating is not permanent, but the kit is insanely easy to use. (It is a combination lens cleaner/coating liquid, so applying it to dirty lenses [within reason] is okay.)
I bought this for use with my regular glasses at water parks this past summer. It's an awesome coating, and well worth the $20. So far, it seems to last about a month. However, I cleaned my glasses with a cotton T-shirt after that first month.
My regular glasses are old and scratched, and I simply cared more about getting the dirt off than taking care of the coating. Plus, the $20 kit is good for approximately 50 applications (according to the packaging), and I was on #1
FYI: I could see clearly through the lenses after being submerged in a pool, though there were beads of water on the lens. Is absolutely eliminated the thin film that distorts your vision when glasses get wet. Plus, coatings like this need a layer of air to work properly at all times, so immersion is not recommended anyway.