I don't know if that's me you are referring to but 110 degrees may be a bit of a stretch (just didn't want to be accused of the classic Texan excesses). My Jeep does sit out year round unprotected in temps up to 100 or so and the temps inside are no doubt often far in excess of 110. Note in my post that I used a heavier duty 3M spray, designated at that time as # 8090, about $16 a can at O'Reilly (only place I could find it locally) and I used three cans. I have no personal knowledge about the relative merits of the various 3M sprays but at the time I did mine, I found a primitive forum where several posters emphasized that you should use the heavy duty spray or risk short term sagging and ultimate total failure of the job. As I stated, I probably used too much of the stuff but decided that if I was going to go to all the trouble, I wasn't going to risk having the whole mess fall down in a month or so just to save a few bucks. Others can chime in if they have had success with the 77 spray but I would not scrimp on the amount used in any event.
Anyway, I don't know how designations have changed over three years and how they compare to what I used, but my new Parts Express catalog includes the 77 adhesive @ 9.96 a can and Foamfast 74 @ 13.40 a can. Also a Hi-Strength 90 adhesive @ 14.40 apparently for laminates with no mention of fabrics.
I expressed doubts in that I didn't have a clue as to how to do this job to the saleslady at the fabric store where I got the foam-backed material. She said she had recently helped her daughter do her headliner and she would pass along to me the only necessary and classic advice: preparation, preparation, preparation.
BTW I don't remember exactly how to get the washers off of the little studs but you do not need to destroy them -- they are reusuable.
Good luck!
