You could even cut up an emeryboard,or raid dh tool box for sand paper,put a dab of hot glue on them,or a drop of scribbles paint in the squeeze bottles.just make sure to let the last one dry completely.
Kathi

I've also used rubber glue; just "X" scattered on the printed side. So far it hasn't peeled off.

I recently read a hint/tip to use shelf liner for marking quilting patterns. Spread on the quilt top, mark for the pattern, quilt and remove. I haven't tried it yet, so I don't really know just how well that would work.