Seat back shells

Anyone restored the bucket seat back shells on a '66 model. They look to have some sort of rubberized coating. I have some shells with a few scratches, dents, and gouges and would like them to be nice again. I'm sure I could strip them and hammer out the dents, but, what do I use to recoat them again?
I'm getting ready to redo the set for my wife's car. I'll be stripping them and doing a vacuum formed vinyl cover back over mine like the originals (they were vulcanized though so a different process but it'll work the same for me)
. I did my set on my 66 charger right before I sold it and they came out nice. 8 years later they do show some "kick and scuffing " but that was from all the back seat passengers getting in and out of his car. I'm really surprised they still hold to the seat back as good as they do since it was the first set I did and I just used 3m #77 spray on contact cement to hold the vinyl on the steel shell instead of the good stuff from Landau contact cement from weldwood.