Friend Randy who runs a machine shop an walking advocate for Hoof Heal from Tractor Supply stores. He had a deep 4" gash on his forearm, applied the Hoof stuff and tape , four days later it looked like two weeks into the healing stage. Me, while I putting a new shingle roof on Mom's place , it started to sprinkle so I put the 15 lb rolled felt paper on as quickly as possible that's when I stared to slide backwards on the wet paper, my last attempt to save my ass, I dug the claw of the hammer into the plywood, out of my hand it went, gravity declared itself the instant winner. Off the roof for only about 8 feet into large Yew bushes that's what really hurt like hell .