Originally Posted by jackytdunaway
I found 4" wide x 1/16" thick gray from a company called permatite. Since they only sell it in case of 200' rolls i had to find a distributor who was nice enough to have Permatite run me a sample about 12' long. it is great stuff
I thing Grainger sells a very similar product that us wide and thin.
The op's stuff looks like butyl but it is quite thick..