I need to perhaps clarify my question about the gel pens. My problem isn't with what to use except that when I use a pencil the fabric moves or the pencil won't leave a mark. I thought maybe the gel pens would be smoother and not push the fabric. I do have the quarter inch ruler with the points on either end and the holes to mark for the middle and then you mark down the sides. But for some reason, my lines never are straight and I end up not having a true quarter inch seam. I also use the sandpaper to hold the fabric. Don't really know what I'm doing wrong! So frustrating! I can mark the center line just fine but then cannot figure out how to sew a quarter inch away from it. If I mark the quarter inch seam lines, they move on me. Thank you all for your tips and I will continue to try the different ones I am not already using. I do appreciate your help. I am going to order the gel pens while I can get free shipping. lol! Everyone have a great week!