Uni Posca has been around since the eighties and remains one of the most widely used paint markers available. The water-based acrylic paint is permanent, opaque, and covers both light and dark surfaces — light colors sit cleanly over dark backgrounds and vice versa, which is a big part of why the marker caught on across graffiti, illustration, and surface customization. Works on canvas, paper, stone, wood, glass, plastic, and metal, in tip sizes ranging from 0.7mm up to a 15mm block tip.