回答“What adhesive / glue is best for screen replacement?”B-7000 Multipurpose High for Industrial Glue Semi Fluid Transperant Adhesive. Saw a video on a screen repair for a LG K20 repair and this was the glue he used. I purchased it from Amazon and tried it out. Fell in love on first use. Goes on easy and controllable. Its thick but not to thick. Not messy and after applied I have never had an issue with my screen coming loose. I recently broke my screen again so no once my new new replacement screen comes in I am going to find out how hard it is to remove a screen that has this glue applied. I usual use a heat gun to separate the screen from the phone. Will follow up when done.