The purist in me wants to try and dig to find info on exactly what the PlastiKote was on mid 60's Williams machines; kinda like how people dug up info on what diamond plate actually was.
It would be nice to see if there was a modern day equivalent; albeit probably not but at least i would have satisfied the curiosity in me.
I have been to the 6th page of google and also went as far as contacting the PlastiKote company (now owned by valsapar) without much direction as well.