I have not even looked to see if I have insulation like that in my basement but I will check. I bought the stuff to convert my copper drain pipes to plastic. One leaks and the rest are probably rough on the inside since they're original from 1962.
I will look at the primer option. I just figured nobody would touch the ceiling so I might get away with paint alone.
This is the least fun I've had so far on the layout! But I know that the time to do this is now; not when the layout is up and models and whatnot installed. It'll be worth it!