This is built for non-porous surfaces only — glass

boost opacity

16 micro-perforated rear sheets per journal

or leaving highly visible signs in places where regular markers won't stick or last

on the run otr 8190 colored steel tip pen Trab This is built for non-porousThe OTR. 8190 Steel Tip Pen comes with a robust 1mm steel point tip for precise markings and corrections. The colored correction fluid is highly opaque and fast drying, covering even dark surfaces cleanly without smudging. 12ml capacity in a compact design that's easy to carry. Available in five colors. Works for technical applications, fine details, corrections, or industrial markings. The steel tip stays sharp and puts down consistent lines. Fast