I think I can be of some help. My 76 coupe’s headliner was dingy and stained, but otherwise, looked pretty good. I thought it was a worthy $80 gamble to see if I could save it.
I’ll send pics later tonite, but VERY happy with my results. Mystic White. Other local air cool peeps were impressed as well.
https://www.semproducts.com/product/vinyl-coattm/M25093