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Hi I have a phone with a minor crack bottom of the screen, I dont want to change the whole screen, but is their a guide that shows you how to silicon fill small cracks?. I need this info asap!.

You can’t do that, the silicon will seep into the LCD and break the device slowly over time. The phones LCD would not last much longer after you put the silicon on, then you would have to replace the glass and LCD. If you want to fix the crack you must replace the full screen.