Yes, it depends on how much you use. I used a lot of it, and no problem. Just TURN THE PHONE OFF! That way, if any of the baby shampoo+water gets inside the phone. It won't shourt out as, you will set it to dry for 24 hours. I used my phone right after installing it, with no problem. I've installed the shield on 3 3G iPhone, 2 times on an Original iPhone, and once on a iPod touch 2nd generation. I never activated the water sensors on any of them.