I just noticed a sag in my headliner last week, not real big, maybe about a square foot area. I've been trying to think of a non-staining glue that I can squirt thru a syringe or something?
Does anybody know how to fix this?
TIA

About the only adhesive that will readily flow through a syringe is ca(cyanoacrylate - aka Crazy Glue). But that can be pretty dangerous with certain synthetic fibers and may eat it away. See if you can find a small snippet of carpet(headliner) from a non-exposed area to test it on. Because, I'm sure ca will hold it just fine.

That's a good idea. I might even have some CA model glue with the long skinny tip, I may be able to poke it through the fabric, give it a squirt and keep working it from one end to the other.
Thanks

On a side note, here's another little tip:

If you have any of those inflatable toy needles(like for basketballs and boat fenders) you could cut it down and make a perfect delivery system for the adhesive. You could probably shove it the end of your glue bottle and voilla!