This is a solution for smartphone screen protectors that are incorporated into a protective case. For me, this is the OtterBox Defender Case for iPhone 3G S. I use this top-notch case because it really protects the device from drops and from exposure to water (but it’s not waterproof!). The case includes a screen protector. The problem is the protector lies on top of the iPhone screen. It doesn’t use adhesive to stick to the screen. Therefore, with general use, the protector sticks to the screen in some areas and not in others. This issue might or might not bother users, but it isn’t attractive. Some people call this a watermark (a watermark is something else, actually).

Then I saw a tip about using baby powder to solve this problem. Initially skeptical, I read on. Then I tried it. And it worked! I don’t see any powder, and I don’t see any air bubbles, either. It’s great!

1. Disassemble the OtterBox Defender and remove the iPhone.
2. Thoroughly clean the iPhone screen and the inner side of the screen protector. I find that microfiber cloths work very well.
3. Ensure the powder container is closed. Vigorously shake the container for about 15 seconds. This creates a “cloud” of powder within the container.
4. Tap the dispenser lid to have the powder clumps fall away from the lid.
5. Open the dispenser lid and hold the inner side of the screen protector over the lid. About 2 or 3 inches should work.
6. Gently but quickly squeeze container so that the “puff” contacts the screen protector. Remember: If you see the puff, then you’ve likely applied too much to the protector.
7. Without touching the screen protector, check for powder spots. If you see any, then repeat steps 2 through 6.
8. Once you’re satisfied with the powder application, place the protector over the iPhone to test it. You should not see any powder and you should be able to press firmly on any part of the protector without it sticking to the iPhone screen. If either of these tests fails, then repeat steps 2 through 8.
9. Reassemble the OtterBox Defender case. And you’re done.