I have reservations about the Frixion pens so I don't use them for anything that is going to show-just in case the lines come back or fade the fabric. However, just a day or two ago I saw an advertisement for a gel type pen for marking quilts that is available from Nancy's Notion. You might wan to check that out because it did sound like a new take on this type of project. I, like many of you, find that marking products are really challenging. I have a drawer full of things I have tried. Some are great and others have been read duds.