saging roof?

I dont think it will work. If it got wet enough to sag the headliner board, its guaranteed that there is enough rust on the inside of the roof line it wont stick past the end of the driveway. I have never done it so dont quote me that it wont work. I just wouldnt have high hopes of it working.

It costs a little more than a syringe and silicone, but will look alot better. Get an abs plastic replacement. You can get them covered or uncovered and paint them to your desire.