Well that's pretty decent for a sling. I was able to get an edge with it that could cut the hair on my arms but not on my face. Ironically, I could shave their heads but not their faces. Most annoying is the fact that the impact has a noticeable wave on both sides, which becomes even more noticeable as you add the mix because it wears away where the blade actually touches the skin, leaving the skin completely intact. I can't build the mixture high enough for it to actually make contact without being too soft in application. I'll find a way to polish it, even one that makes it useless for anything other than kitchen knives. If I could get one that actually has a flat surface then I'm pretty sure I could achieve the level of sharpness required.