My grandson's phone has a plastic film screen protector that had lots of
air bubbles under it. I tried to improve it but eneded up making it
"unsticky".
I want to replace it but note on EBay that they sell "Tempered Glass" film
protectors. Are they really glass - or is it falsely described? If it is
glass, then does it mess with the touch screen? I really just want a normal
clear plastic protector - unless you convince me otherwise.

Any ideas (the phone is a Samsung S3)