got in my truck today and noticed my headliner starting sag,95' f250,its not leaking water or anything like that,is a special glue or any tricks to fixing or is a new headliner not to expensive? thanks for your input..

 

The hardest part of putting in a new headliner is clean off the old glue ,Iused a rolix pad to do miine and lightweight fabric,and a can of 3m spray adhiseive if you use foam the use the orange foam safe stuff also from 3m I did not use foam just glued the fabric right to the cardboard backing oh yeh take it out of the truck first I like the clean smoth bends in the liner that you can't get with foam total cost about 25 bucks

 

I saw this trick on "Trucks!". Remove the entire headliner assembly, fabric, foam and backer board. Make a couple of tiny index marks so you won't lose how the fabric aligns to the backer. Peel off the fabric being careful not to stretch it out of shape. Like on the show, I took some 1/4" foam sheet (JoAnn Fabrics) and cut out a flame pattern. Using 3M 77 adhesive spray, I soaked the cab side of the backer board and applied the flame cut foam. It's best to let the spray adhesive "flash" for a few minutes before laying up the parts (the glue gets tackier). After about a half hour, I sprayed the cab side of the backerboard again, but used less glue than before. Again I let it flash for a minute or two then carefully layed the fabric back in. I folded it down the front to back centerline and aligned it with my index marks and slowly and carefully adhered it to the backer board. I had to make certain that it was tight, but not stretched. After the whole section of fabric was in place, I pressed the fabric along the outline of the flames to make sure there were no voids between the fabric and the backerboard. It did stretch a bit and i had to trim a little fabric, but it turned out fantastic. A guy who saw it did his own, but created a ford oval logo instead. You certainly don't have to apply a sculpted foam layer, the process will work just fine to reattach a separated headliner.