My water-wetter "dissapeared" in my system when I first put it together (coolant changed from pink back to clear). I just added more pure water-wetter to the coolant again till it was the original shade of pink again, and it never went clear again after that, though it has started to turn slightly milky after a year now.
I think it has to do with being a slightly different density than the water, it's probably filling in tiny imperfections inside the pump/block/rad and stuff. Or if it really is evaporating in your case - can't you just shake your res a bit to re-mix it back in and see if that does the trick? If it does help, then all you have to do is top the res right up so there is no air space in it.
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