I done both my Z and Z Ultra under water works mint just make sure it fresh water I used a glass baking bowl. And covered over the handset by about 3 inch. Good thing with doing it under water is once u got it on you can adjust it. Also don't take off the second layer normally marked as 2 till after all the the handset is full dry mine took around 14hrs otherwise you will just pull the whole thing off.
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Mobile History = Xperia Z Ultra (current), Xperia Z, Xperia X10 Nexus 3, Xperia S, N900,SE X10i, Nokia N95 8gb, SE W960i,SE k750i, Nokia 3650, Nokia 7600, Nokia 7650, Nokia N8, Nokia N97, Nokia N73, Nokia 6111, Nokia 6680, Nokia 6630, Nokia 7610, Nokia Ngage, Nokia 3210, Nokia 3310, SE W910, SE T68i, Sam D500, Sam D600, Iphone 4, BB 9800,
Ill add the rest as i go along.