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I recently got a CaseCrown case for my iPhone 4. I decided to purchase the screen protector from the same company since it was only $5. I have placed screen protectors on several phones and done so successfully. This is the first time I have had trouble putting on a screen protector.
I think the reason this one is hard to put on is because it is sticky on one side. The ones I have used successfully stick to the screen because of...well...I don`t know exactly how it works, but it isn`t a sticky substance, just static electricity I guess! What makes this easier is that if you accidentally touch either side or get dust on, you can rinse or wipe it off and try again. With this CaseCrown protector, because it is sticky, you only have one chance and if it gets a smear or piece of dust (as mine did), then you basically have to throw it out (which I did).
What a waste of $5. I would check out a different brand and will do a follow up post on the one I purchased and loved!