Review (5/5): A life saver when your hand twitches.
You only need to use the very tip very lightly to clean up little mistakes. Works very well and has saved me a lot of swearing. Only downside is that you really need a q-tip or something to wipe off excess, otherwise your edges get a little blurred throughout the day, or you can't re-apply over the same spot to sharpen it back up without it going on kind of funky.