I took a class from Sharon Shamber, who LOVES the Pilot Frixion pens. We did this in class, amazing how a hot iron makes it totally disappear.
She also warned that the pounce pad isn't recommended if you have a newer computerized machine. She dont' like it at all, as the powder of the chalk will get into your machine.
She also gave another tip about using mineral oil on ALL thread, metalic, cotton, silk (her favorite). She places the oil into a jar, drops the whole spool into it, in a few seconds removes it and wipes it off and starts sewing including filling the bobbin don't forget. Stops breakage, smoother stitching, no static of friction. she also recommends the bobbin discs (little white disc you place in the bobbin case)prevents static and jumping. I'm going to post new and share a few tips for you from her...she's won a lot of awards, wonderful to learn from.
http://www.sharonschamber.com/Home%20Page.htm