I need to install the headliner in my '37. It's one of those you have to form with a water and ammonia. Should I paint it on the back side?

What about the insulation you are installing? What brand or kind is it? I have been looking for awhile trying to decide what to buy. The Dyna-mat is to much money. I wanted something for noisy and insulation. The tar base stuff won't hold to the roof if it gets to hot, will it ??? Does the cotton fiber with foil back type work? How do you glue it up so it will stay? Joe