Uni Paint is an oil-based enamel marker built for surfaces where water-based paint won't hold — metal, glass, rubber, and industrial materials. The paint dries with a glossy finish, bonds hard to most surfaces, and is used as much in industrial settings as in art and graffiti. The PX-20 and PX-30 in silver are the most recognizable in the range — the go-to marker for metallic tags worldwide.