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Any recommendations for a liquid adhesive to adhere the screen on an Apple Watch back down? I did a battery replacement and the new force touch gasket I put on is not keeping the screen in place.

Sounds like the surfaces where not clean enough! Any oil or cleaner reside can prevent good adhesion. I often find people using cheap isopropyl or rubbing alcohol have issues as these won’t evaporate without leaving a film. I use reagent grade 85% isopropyl alcohol. You’ll need to get a new Apple Watch Adhesive Replacement. Using any glue will interfere with the force touch sensor.