Unfortunately, it has held air for me as well and does not go away, and it has scratched in the 4 days that I have had it

It fits relatively well. Sometimes it can trap air between the watch and the protective glass.

Unfortunately, besides some membranes, it is the only screen protector available for this specific watch. Easy installation, it protects and does not affect the screen in any way, bubbles with a little lift from each side and pressure easily disappear. BUT... depending on the batch and despite the good installation and removal of bubbles, it leaves marks of the adhesive in some areas that are visible on the inside of the screen, and the most important thing is that it comes off easily if pulled by clothing or if the edges of the protector touch something... It's not a glass protector... maybe a plastic "protector"...

While it is easy to apply and protects the entire screen, unfortunately the "adhesive" it has does not hold at all.
The first glass protector I applied had some bubbles, but I managed to remove them and it lasted for about a month until one day I found it on the floor.
It had come off on its own, obviously when I took off my shirt sleeve.
I thought it was a coincidence and I put on the second glass protector I had purchased without any bubbles.
This one came off on the second day.
It's a shame because I haven't found anything to protect the screen.
Even a plastic transparent case that I found, broke at the delicate points and kept coming off constantly, leaving a mark on the button.

While I placed it perfectly on the edges, it developed some bubbles and within 2-3 days they became huge.. I threw it away