I got myself a WG3-GPS (identical to WG4) after my Pentax W-90 took the water. I stayed with Pentax thinking that I had misused my old camera. So I used this WG3-GPS with great care, but he took it malgrès water after 3 or 4 bathrooms. My device is currently in PM2S (SAV Pentax - Ricoh) and they denounce the guarantee: "misuse"
How can you sell a "watertight" said apparatus while taking in water. A quick look on the net shows the extent of damage.