Anyways I tried to stick the sagging headliner by spraying some 3M super 77 adhesives. Well it worked for a few days and then it started to sag again. Now the entire headliner is blocking my rear view so I had to remove the whole headliner off.
The 3M super 77 adhesive is all over the place and wondering how to approach a good long lasting repair of this. There is a thin layer of some foam that GM used and wondering what, how and where to find this? Any help is highly appreciated.



took quite some time to remove all the super 77 and original foam





under the roof looks great still.