I don't really see the point of doing this if you are going to restore the blade at all. Is it just for removing rust on a blade that you weren't planning on sanding? Looks like this method removes metal anyway, so wouldn't you have to restore it afterwards? Honestly, when you sand a blade to begin restoring it, it takes any rust away immediately. I'm not putting this method down, it just seems like a lot goes into this to take rust away.