look for various signature blocks, album blolcks, etc that give a space for signatures. By that, i mean blks that have a strip of light fabric that is added for signing on. that doesn't have to be batik. i think you would be better off doing that. then lightly heat set the signatures and they should stay fine. and when you wash the siggy fabric, do not use fabric softener. Micron pigma pens size .05 are good. I swapped for years and my quilts are still fine.