Work on the AC headliner (which is different than the non/AC one):
Used three methods to scrape the old foam backing off the cardboard.
Then I used 3M 90 Spray Adhesive from Home depot
The bubbles were disappointing as hell, but it looked a little better in the morning.
This was the old headliner (all the foam backing had deteriorated), and I had read that using the old stuff does not work well, as the foam helps make the final cloth look very uniform.
So if you try this at home, us NEW headliner material. I'm going to see if I can buff it out a bit and use it as is for now...
But man I was sad last night!