66 Barracuda headliner install question

Excellent. Thank you.
I’m hoping this guy is just rusty. I offered to bring him my car to his shop but he recommended it be at my shop. He’s at about 3-1/2 mark and still a tad wrinkle ly. He said about 1 or 1-1/2 hour more if heat is a applied. So not off base I guess. He is very talented and he’s done work for me and my company before. I am not sure if temperature is actual case or he’s just getting older and this is tougher than he remembers on the body. Thank you! Joe