alexy wrote in -
september.org:

Well, not really, but safety glass is the idea. I need to remove a
mirror that is stuck on a condo's wall, presumably with some kind of
construction adhesive. I'm thinking of using spray adhesive to bond a
piece of plastic sheeting to the surface before beginning the removal,
to minimize the danger and mess if (when?) the mirror breaks during
removal. I'm thinking very thin sheeting (1/2 mil) to maximize
flexibility, so glass will be less likely to break away from the film.
I also thought about latex paint on the surface to serve the same
purpose.

Any suggestions about this: Thickness of sheeting to use? Something
else to keep broken glass under control?

And any suggestions for doing the removal while minimizing damage to
the drywall beneath it would be most appreciated.

There's adhesive carpet runners out there. They're about 30" wide by
several feet long. That might keep everything intact if something did
break.

Puckdropper