Used to have trouble with porcupines eating salty/sweaty things. (axe handles, etc.)
Bar tape might be a very tasty treat to them!
I'm with KY.
Porkies are really big salt fiends. People will go to their hunting cabins and their outhouse toilet seats will be eaten, the arms of the rocking chairs chewed off, etc. Basically anything that had salt on it, they'll eat.