need some info to get liner back to the roof

 

Maybe it's just me, but some useful info might be included with your post: What year/type (hardbody/t-top), headliner; specific problem (sagging/replacement).
TRY AGAIN!

 

Yeah, have it recovered at a trim shop. $50 - $100. It's a little tricky for a DIY the first time.

If you do try it yourself, use actual contact cement on both sides and let it tack before you stick 'em together. Get all the old crap off the shell first. And use real headliner material. Last time I checked it was like $5 to $15 a yard, and takes maybe three yards.

If you really cheap out, they sell "headliner tacks" that you can stick it back up there with.