Whatever you decide to put in there, I’d go with something that is impervious to, and that will not hold or absorb moisture. I went with a 1/2” thick closed cell peel and stick mat with foil on one side. No issues with fitting the factory cardboard headliner on my ‘50 3600. It is completely hidden and won’t cost you any points at a show…. Unless the judges are doing a tap test on the top of your roof!
Last edited by Norcal Dave; 07/17/2022 12:48 PM.
