Another type of paint marker is the solidified paint pen. This is a type of marker, often contained within a twist tube, that is a cylinder of semi-hardend oil-paint with a pointed tip. As one writes with it, the point wears down and must be advanced to in order to continue writing. The marker leaves a mark similar to that of chalk. It is useful for marking on wet or oily surfaces. It is sold under the brand name MeanStreak in the United States. It is made by Sanford, the maker of Sharpies, but there are many different brands and types of solidified paint pens
Theres some stuff about meanstreaks.
I couldnt really find anything very useful.