[GuyWithNoLife]

I just picked up one of these and installed it myself (front screen only... had a rewardzone certificate from Best Buy so I just grabbed what they had).

The installation instructions are similar to installing tint; it comes with a solution (containing diluted isopropl (sp) alcohol and whatever else) that you're instructed to:

a.) spray on your clean fingers (to remove excess oil)
b.) spray on both sides of the protector

It says specifically to not spray your phone, and you really don't need to, since there's a decent amount of excess liquid when you smooth out the protector (it instructs you to blot it up with a lint-free paper towel if possible).

My water mark did not trigger, but again I only did the front screen. Because of how the battery cover sits, the only way I could see not getting liquid inside when installing the protector on the back would be to remove the battery covery during installation (which seems like a good idea anyway.

It really comes down to the fact that a Best Buy employee tripped your watermark (even if they were actually following the directions for the product) and they should be responsible for resolving this issue for you (imo).