It does make a difference. I tested mine out against my cousin's last fall. His has little to no coating left, and usually has a patina of rust on it as well, mine has just a tiny bit of wear at the edge but still feels smooth as butter. There was no difference in actual splitting, but the head on his definitely got stuck more often and got "more stuck," too. I guess if you're a real manly man and always bust rounds on the first hit, you wouldn't have to worry about the difference. I'm not a real manly man... all the time. Never tried teflon spray or any other lubricant on the head. Can't imagine it would hurt anything, but not sure how long your application would last before you need another squirt.