Seperate Display from cover

The Water resistant glue of my pebble time Steel became old… the frontcover started to seperate from the body. And there was some humidity between display and Front Glass. I could easily pull the Front from the Backcover and Detach the displays ribbon cable. But now i wanted to remove the humidity between Cover and Display but i can not Figure Out how to detach the Display from the Glass Front. It also seems to be Glued? Any advice? Heatgun?