I am on a quest in search for a white, waterproof pen that reliably lays down a thin, opaque line. You'd think that this wouldn't be so hard to find, but this combination (opaque-and-thin-and-waterproof-and-reliable) has so far proven to be elusive. The closest so far has been the Uni-ball Signo Broad UMR-153 white gel ink…
POSCA Paint Marker, PC-1M Extra Fine, Yellow
Uni-Posca Paint Marker Pen - Fine Point - Set of 15 (PC-3M15C)
Posca 8 Color Paint Marker Set PC - 3M Fine Soft Colors
POSCA 8-Color Paint Pen Set, PC-1MR, Extra-Fine
Uni Do! Posca Paint Marker PC-1MD - White - Extra Fine Point
Non-toxic, water-based POSCA paint markers can be used on almost any surface, and are loved by professionals, creative hobbyists and amateurs alike. The alcohol and solvent-free opaque paint covers well, is blendable, dries quickly and can be overlaid when dry. ACMI certified and made in Japan. The PC-8K broad chisel tip marker draws neat curves and covers large surfaces. Ideal for flat-tints, urban art, sign making, interior design, board customization and more.
Posca PC-8K Broad Chisel Paint Marker, White
I Tested EVERY White Pen to Find the BEST! White Pens: Part 1 - Sarah Renae Clark - Coloring Book Artist and Designer
POSCA MOP'R paint markers feature a round foam rubber tip and innovative barrel design for a generous application of color. Create large drawings horizontally or vertically with the MOP'R. It can be used right side up for finer details or upside down for high link flow. Use MOP'R to create an endless variety of effects that are harder to achieve with other tips. It's perfect for creating splashes, stamps, spray effects, drips, highlights and more.
Posca MOP'R Paint Marker White
Non-toxic, water-based POSCA paint markers can be used on almost any surface, and are loved by professionals, creative hobbyists and amateurs alike. The alcohol and solvent-free opaque paint covers well, is blendable, dries quickly and can be overlaid when dry. ACMI certified and made in Japan. The PCF-350 brush tip marker combines the advantages of a paintbrush with the benefits of a pen.
Posca PCF-350 Brush Gold Paint Marker