i have a79 z28 with the original one. my problem is that i tried to fix it 2 years ago and now it has shrunk and is hanging down whatr are my options or does it need replacing? any help would be appreciated

 

replaced the entire headliner on my old '84 several years ago. Pep Boys sells kits (back then it was about $35 for the new liner material and $7 for two bottles of adhesive).
It took a solid afternoon to do but literally looked brand new and never sagged again.
Give it a try.

 

Autozone has the kits. Check J. C. Whitney, as they have some different options.

 

thanks for the replys guys but we dont have a pep boys or autozone in canada!. we took the cardboard out and laid it flat on a bench and put the adhesive on the board and put the original material to it and it is holding good.the material has shrunk and has to be applied carefully. also the crappy moldings have to be removed carefully as the plastic has deterioted.