The Mighty Marker IM-15 Industrial Bleed-Thru Marker is a high-performance marking tool engineered for professionals working with unpainted metals. This super jumbo marker contains 30ml of bleed-thru ink, specifically designed to remain visible through oil-based primers. Once the surface is primed, the original layout marks reappear clearly, eliminating the need for remarking and ensuring efficient workflow throughout the fabrication and coating process. Equipped with a precision broad edge tip, the IM-15 offers multiple line width options—2.0mm Fine Edge, 7.0mm Medium Edge, and 15.0mm Broad Edge—providing versatility for both detailed and large-scale marking requirements. The valve action mechanism delivers consistent ink flow and prevents the marker from drying out, even if the cap is inadvertently left off during use. To fully seal the markings and prevent bleed-through beyond the priming stage, the coated surface must be finished with a water-based or alcohol-based sealant. This marker is intended for use exclusively with oil-based primers and is not compatible with alternative coating types. Proudly Made in the USA and sold in a convenient 3-pack, the IM-15 is ideal for applications in structural steel fabrication, shipbuilding, metalworking, and other heavy industrial environments where precision and durability are essential.