In addition, the line is very opaque and, unlike spirit-based or other permanent inks, will not fade with exposure to UV light, and overlays all other colors beneath it.
Like spray paint, these markers give off volatile organic compounds, which can be dangerous when used in a badly ventilated area or without a particulate mask.
This is a type of marker, often contained within a twist tube, that is a cylinder of semi-hardened oil-paint with a pointed tip.
Their most general usage is on windows, and they are often used to advertise sales or discounts meant to bring prospective buyers in.
Paint markers have gained more general usage in the arts and crafts community for a variety of uses.