> Check out Dan's (Reed?) experience with this type of material on his
> website:
> 
> http://faculty.ccp.edu/faculty/dreed/Campingart/vanagon/Doorbaf.htm
> 
> even comes with a comparison sounds of door closings.
> 

And he has a product name! Googling for 'leak stopper roof tape'
brings up some leads, and from there leads one to Google for ' "Peel &
Seal" roof tape'. This looks like the stuff! Yes!