The Uni Posca markers is one of our most popular markers and therefore we always have a huge selection and competitive pricing. Posca was one of the pioneers when it comes to paint markers, their first markers was introduced to the market in the eighties and quickly grew in popularity due to the opaque paint that could write on any surface. The water-based paint is permanent and perfect for writing and decorations on canvas, paper, stones, wood, glass, plastic and metal. Dark surfaces is no problem since light colors covers dark and vice versa, this is probably why it got so popular amongst graffiti writers also.