DYKEM® BLEED-THRU™ is a fast drying ink marker that writes on almost any surface. It is ideal for fabricating structural steel or layout work where marks are required to bleed through a primer coat covering the marks. Marks bleed through when painted over with oil/solvent based paints and primers. Makes permanent marks on plastic, metal, glass, ceramics, and most non-porous surfaces. It can be used to permanently identify inventory, assemblies, machines, or finished products while resisting most work related abuses or compounds.