I used those things for marking grid lines on scenery backdrop. I wouldn't try it. Just get some 1" wide painters tape and using every ruler your have, mark you center line in both direction. I use a Clover Hera marker.
http://www.joann.com/clover-hera-marker/9620873.html
No chalk or ink, it just makes a slight dent in the fabric and batting that you can see. Always keep checking that your lines are true and accurate to you center line.