What do I do with Adhesive Gasket

What do I do with Adhesive Gasket

I have an apple watch 3 series I’m not sure what to do with this piece { Series 3 GPS) Force Touch Sensor Adhesive Gasket } I replaced my screen and the seal and it works great , but my screen is a little loose on one side .Is this what this piece is for ? What would it do to the seal if I had to take the screen off again ?