I put it up with clothes pins holding it around the edge as would the rubber and it saged in the middle. I then put some 1/8" self adhesive insulation/sound deadner to the roof. Then I used 3M adhesive to glue the headniner to it,letting it stay untill tommorow.I will then try putting the rubber in.

Originally Posted by enigmaT120
I have rubber lube for installing tires, so I would use that. WD 40 might work; will it damage rubber?

My reproduction headliner was rigid enough that the rubber part held in firmly in place with very little sag. I didn't glue it up.