I'm so glad you posted on this subject as I have been looking for a marking tool that really works. I started FMQ about 2 years ago and so far all I have done is the rambling stipple patterns because I didn't have a reliable way to mark a pattern. One thing I know is to not blindly mark the whole quilt until you know for sure the markings will come out, don't ask me how I know this. I think I'll try the washable Crayon markers next, but I'll test it on a scrap piece first.