step 1: Find spray glue and a glossy surface.

It's important to find something that doesn't bond on contact.
step 2: Spray glue in puddles.

completely saturate one spot to form a puddle. Be sure to shield off anything around you during the spray session. Particles get in the air.
step 3: (will be different for you) Apply the glue.
Like I said before, my seperations were clean breaks. I took the severed portion and dipped it into the glue puddle. Qucikly, I mounted the plastic bubble to the container directly over it's original spot.
Because the glue didn't quick set, I was able to adjust the bubble as needed.
this is an original bubble, sealed from the factory
this is my work
with your application, you need to think of a way to spread the glue to your plastic bubble. Qtips are a bad idea because of the cotton fibers. Foam brushes will stick.
I'm thinking maybe a pencil or something wooden.