In the never ending saga of Jag headliners, mine's loosened and flapping in the wind but, I have this lipping condition st the rear edge of the sunroof. Anyone ever deal with this? I can have the material replaced but I think the substrate is dropped and buckling...and it's much more noticeable from a level view than this underneath shot.

 

Just the foam backing of the material showing. Needs replacing no other way to do it properly.
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So replace the backing material too? Best place to find one?

 

The correct material is supplyed with the foam pre attached on its back side !
You can actuly stick that back up with contact spray adhesive such as Ados f2 , the trick is to coat both surfaces with F2 and let it dry before contacting it back in to place !
But genraly the reason for it seperateing is due to the foam dry rotting and letting go of its adhesive so it will happen again with time !

 

I have tried to repair many a headliner. Just remove all of the old stuff. The glue and foam have now decayed and you need to get ALL of it out of there BEFORE adding any more glue.

So remove the headliner. Pull all the old material and foam backing off. Clean and prep the backing board as best you can. Extra time here will pay off in the headliner staying in place much longer.

I am also in favor of using expensive industrial spray glue. All the good shops spray glue out of a HVLP spray gun but us home guys can get a good job too using spray cans.

Something like a 3m Hi-Strength 90 OR 38808 or Super 90. The cheaper and easier to find 3M 77 I do not use. Other brands will work but plan to spend $15+ per can to get a heat resistant product that will last.

Headliner material is very common. Try EBay or your local headliner shop. EBay will be cheaper. I would also do some searches on this forum on headliners. We have had people post some very nice instructions. Just a heads up in getting the entire headliner out of the car. It requires a bit of a trick and holding your mouth right. The shop manual has you removing the passenger front seat but several member's have got it out the passenger back door opening with careful flexing of the headliner. Be careful here! If you kink it, it most likely will show thru your new material. Get some extra help when taking it out and putting it in the car to prevent damage. It's not hard at all but it is fiddly and detail driven.
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Thanks all, by backing material, I meant the flexboard it's attached to, not the foam backed fabric. And in Florida, we have so many good headliners shops(almost all cars lose them in the heat) that for 150ish US I can have it done for me. My mom's minivan came out better than new(until I left the sunroof vented and stained the new material).

My base material seems dropped a bit at the sunroof and can be pushed upward ~1-2". Is there an attachment point there that's perhaps come off?

 

And today, I pushed up on the dropped HL and saw that there's velcro strip on the roof side. It hung on for a couple miles but then dropped back down an inch or so.

 

Take it to an upholstery shop and get it done right. Mine cost $290. Not bad for how good it looks again.