Sounds too good to be true right? Those black ugly lines from a marker seem to never go away, no matter how much you keep cutting in on them. And then those special pens that are supposed to disappear on their own?! Don't get me started. They are better than a marker, because you can at least get them off with water. But disappearing by air hasn't happened for me!
But, I have found a method that saves you time and leaves you with perfectly cut felt pieces with NO tracing marks.