Ed,
In 2012 I went on an Alberta bear hunt with some friends and we made bows for that hunt, another friend gave me some bear grease after I mentioned that I wanted to put a bear fat finish on my bear hunting bow.It's great stuff, just rub it into the bow, it makes a great finish, I thought at first that I'd have to reapply the grease often but after 3 years water still beads up on the bow. This year I steel wooled the bow and put more grease on it, just because I wanted to, it did not really need it.
I also rendered the fat from the bears that I got on the hunt and keep it in a jar in the fridge, it's like pure white lard. I never used it on boots but I've heard of using it that way also heard of using it on chapped lips and hands, it's really great stuff!
Kevin