I used my Frixion pen to write on a lap quilt that I wanted to put Red Work on. It erases with a hot iron and they are about $2 at Staples. Before I start a controversy, yes I know the marks will come back in the freezer. Since I don't plan on freezing my lap quilt, or flying it to a show in a cold shipping container, it worked great for me. If you decide to go with a water solvable pen, make sure to check if your floss bleeds when wet.