Liquipel could make your iPhone waterproof without a case →
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Liquipel claims to make your smartphone water resistant by bonding it inside and out with a “nano” coating which repels water. While this isn’t for deep sea diving, it appears to be an ideal solution if you are clumsy or happen to be around water quite a bit.
This seems kind of cool, but I’d be very hesitant to apply such a permanent coating to my device. The nice thing about cases, screen protectors, etc. is that they are all there to protect what’s underneath; in a pinch, you can get back to the original device. I’m not sure if this would be removable.