Centurys Bleed Thru Marker is a permanent industrial grade valve action paint marker for construction purpose. The unique ink formulation enables the markings to bleed thru and be visible even after painting over the surface that has been marked. It is made up of a hard aluminum body filled with ink and felt-tip with valve action for smooth ink flow. It works on all surfaces like metals, concrete, iron, alloys, plastic, glass etc. The marker is available in two types for oil based primers and water based primers. It is widely used in construction industry, ship building and bridge fabrication on metals & alloys for Used for inspection, coding, layout or assembly operations.