i've just bought Soap and Glory Kick Ass Blur and Brighten concealer crayon, it's got a great pointy end, so that I can get the concealer into the inner corner of my eyes. But once the end is blunt it won't be so useful, and I find concealer brushes quite fiddly.
Obviously if the casing were made of wood like a normal pencil, then I'd use a pencil sharpeners, but I can't because it's plastic. Any ideas?