The uni Chalk Marker makes the world a little more colourful. As a liquid chalk marker, it is ideal for designing smooth surfaces such as windows, panels, plastic and metal. He is a real outdoor talent, which withstands rain. Liquid chalk marker with wedge tip. ideal for use on smooth surfaces (glass, mirrors, plastic, metal and black boards). can also be used outdoors because the paint is weatherproof. the paint can be easily wiped off all smooth surfaces with a damp cloth. intense and strong colors.