64-66 Dart seal between body and back glass trim

I'm getting ready to put the trim around the back glass of my 64 and was wondering what, if anything, I should put between the body and back glass stainless trim as seen in the picture below? I have dum-dum tape and have also have heard of using insulation weatherstipping from lowes or something.

I'm trying to make sure this car is sealed up right. Thanks!