68 dart headliner..
I haven't done a headliner in an older car yet but i have done a few in newer models. 3m has two types of spray glue. 1 is General adhesive and the other is a super adhesive. The general one is the one to use. the super would bleed through almost any fabric i tried(suede, vinyl, cloth etc...). The general has worked fine and have yet to have any sagging in any of the cars i have done.