big box stores
roofing & or windows dept ... under various names
use the stuff they use for window installation.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
as to these type product(s)
see alan's page: they are ALL asphalt products
http://www.alanhorvath.com/54chevy/doors_quiet.php his note says >>>>>> P.S. -- News from the manufacturer: This stuff will hold permanently and will not "run" or slide from excessive heat ... unless it gets over 300 degrees farenheit. :o :o They say, on hot days there will be some gasses emitting from this stuff ... perhaps not too healthy to be breathing ... but after a very hot Summer and me driving around with the windows closed and my AC on all the time, I never smelled anything at all.