[wklauss]

I think there are far better ways to do this on a small object of limited lifespan like a smartphone, not to mention that metal is not an ideal way to make a smartphone. You can use it some surfaces, but at some point you'll need plastic and glass.

[kozlinov]

"I think there are far better ways to do this on a small object of limited lifespan like a smartphone"

Namely?

[wklauss]

Simple hydrophobic coating. It wears out eventually, but by the time it does your device is already gathering dust in a drawer.