Preferably, use a perforating wheel to cut,
but in lack of such, you can cut along lines with a scalpel,
taking care to not cut all the way to the edge.
A mysterious product. No one we spoke to had ever seen or heard of Zam-Buk and yet, the product claims: ""Zam-Buk is a miracle antiseptic ointment used for centuries to help soothe cuts, sores, bruises, sprains, chilblains, insect bites and many more ailments."" Centuries? What exactly are ""chilblains""? I tried hard to track down the manufacturer but they still remain a bit of a mystery. It is helpful as an ointment, who knows if anything the can says is reality, I may be Zam-Bunk'ed. I'll keep trying to find a way out of here.