Good to hear about checking out the glue. I looked at the 3M stuff, confusing, multiple numbers of spray adhesives. I bought the Permatex stuff from Canadian Tire, even said for head liners. Their stuff is usually good, what the hell right? Wrong! I pulled out the headliner removed the sagging fabric and cleaned it all with brake cleaner. Followed the instructions for application and drying. Put it back in place, 2 days later, sagging as bad as ever. I ripped all the fabric off and spray painted the board which looks like sh*t to this day. I need therapy for my experience. Choose wisely, make sure it is high temp and good luck.
The 3M stuff I posted a picture of in the update is supposed to be the strongest you can buy non-commercially. I used it to glue the headliner fabric I bought to the AstroRoof slider board, and I guarantee you it’s stuck EXTREMELY well and isn’t going anywhere. In fact the fabric wants to tear long before the adhesive lets go. I tried.
The multiple listings of 3M glues are for varying strengths and applications.
As for your experience with the Permatex glue, I’ve never been impressed with anything they make. Especially their gasket makers and adhesives. As the old adage goes, you get what you pay for. The 3M stuff is pricey as hell, but I have the utmost confidence in it. I personally wouldn’t use or trust Permatex ANYTHING on anything I cared about.