I have tested every pen I could find, and haven't been happy with any of them. I am getting ready to test a chalk pen I recently bought and hope that it works better than the others. It is new and I got it at the LQS. I didn't buy the actual pen only the refills. They fit in a mechanical pencil that I already have. I wouldn't try those pens since the marks return in the cold. I wonder if you are supposed to erase the marks since there is an eraser on the pen.
Sue