I bought some precut barriers on e bay that came with a gray caulk. Just did a google search and can only find the previous 3M black and this stuff from Eastwood:
http://www.eastwood.com/ew-flexible-stri...CFYdxQgod4iUAPQ

I have had good luck with all 3M products.

BTW, the electricians I work with call the stuff dum dum.
Craig


2014 Ram 1500 Laramie, 73 Cuda
Previous mopars: 62 Valiant, 65 Fury III, 68 Fury III, 72 Satellite, 74 Satellite, 89 Acclaim, 98 Caravan, 2003 Durango
Only previous Non-Mopar: Schwinn Tornado