Mike,
May not be "Coat-It" but I doubt that there will be any difference whether 'they' mix it or you mix it. I did a little googling too looking for "graphite epoxy" and came up with this -> http://www.cgedwards.com/west/Fillers.html

Another article I came across mentioned this site too and the preperation of mixing graphite compound with different West epoxies to achieve a more durable and lighter weight coating. I'd just order the stuff and make my own so to speak.

Good Luck.

BTW - have you seen any silvers rolling up in your neck of the woods lately!?! ;p