Wunder2 SUPER-STAY LINER Makeup Eyeliner Pencil Long Lasting Waterproof Eye Liner, Color Pink Glitter

Can this liner be used on the inside of the lower lid?

Where can I buy a Wunder sharpener?

I have very oily skin, has anyone tried to see if oil smears it?

Any tips for sharpening? It seems like the wood is unusually thick and my sharpener cant sharpen it smoothly, it chops it up