If I need the long and straight lines, I use a piece of door trim (what goes on the wall around the door) and a washable marker. The trim can be found in any lumber store or somewhere like Menards or Lowes. Mine is 8 foot long and easily stores behind the door to my sewing room. But before I use anything to mark my quilt tops, I always test on scrap pieces to make sure the marking will wash out (I use CraZart washable markers).