The piece of plastic at the back, next to the record button, unglued

My G16 had this same problem, not only with the thumb grip but the same material wrapping the finger grip around front; the edges came loose and it was ugly. I've read that they just use double sided tape to glue those thin pieces on. I tried contact cement - fail. Epoxy - fail. Adhering to the rubber and the plastic is difficult. Just clean up the residue of the crappy adhesive tape they used and go commando! Holding the bare body isn't bad - this tiny camera really has no grip to speak of - its too small! I do love the performance though, and its not hard to carry around. Otherwise, I see various rolls of 3M tape on Amazon for around $15 - maybe there is something thin enough available there. And maybe a camera store has a fix that does not cost $100...