I can never decide how to quilt the quilt until after I have started or half done and then it's - i should have done this! But if I'm marking after it's sandwiched, then I like the thin roller chalk marker. Just did this with my lighthouse quilt. I wanted to do crosshatching in the border, but the quilting bar kept moving and my lines were not evenly spaced. So I used my marker and followed those lines. Works really well.