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The pei sheet I got from amazon (https://smile.amazon.com/gp/aw/d/B074XLD5QH/ref=ppx_yo_mob_b_track_package_o0_img?ie=UTF8&psc=1) didn’t have the adhesive pre-applied, it was just smooth on both sides with a thin film over it for protection, and a 3m double sided tape was included in the package. If yours has adhesive already on it, I’m not sure about the temp limit on the film, but suspect you’re right that it isn’t very high.

I had been thinking about just clipping it on before it arrived, but it was thin and flexible enough that I’m pretty sure it would get pulled up slightly by larger prints. I had considered just buying a 1cm thick sheet from McMaster Carr or somewhere rather than one being marketed for 3D printing, I think you could definitely clip that since it would be rigid, but I was concerned if it didn’t show up perfectly flat I wouldn’t be able to do anything about it.

I watched a few videos before putting it on, and it was actually easier than I expected. Even though it has some flex to it, it’s ridged enough that there wasn’t really any issues with bubbles under the pei sheet itself. The adhesive bubbled a little when I put it on the glass, but it wasn’t very hard to either work them out, or in a few cases just poke them with an xacto. The hardest part was actually removing the plastic from the top of the adhesive without peeling the whole thing off the glass, but once done the pei went on nicely. If you’ve seen them mounted before, it’s normal for it to look kind of mottled with some visible pockets of air, but still be flat with no significant bubbles. I checked for flatness and it was good. I will take a picture later and update this so you can see what I mean.

I’m jealous of your 2 backups, I have been afraid to print anything but PLA and be unable to get it off. I ended up with the pei because I kept destroying various stick on surfaces by squishing the first layer of PETG too much and ending up with it welded on.