My paper is red on headphone jack port.
It became red, but the times I washed my phone all the flaps were perfectly closed.
Maybe, its water resistant for some months because the flaps will become ruined..
Sent from my C6603 using xda app-developers app
Phone: Sony Xperia Z
ROM: Stock 4.3 10.4.B.0.569
KERNEL: XzKernel v20
+SanDisk 32GB Class 10+