Pebeo Cerne Relief Outliners are used to designate spaces filled with PEBEO Vitrail, Ceramic, Fantasy paints and also to decorate such surfaces as glass, metal, mirror, Plexiglas, plastic, ceramics, fiberboard and many others. Can be used on canvas and many dry surfaces. Ideal for Mix Media techniques in combination with Gedeo Resins acrylic paints and liquid resins. A special, thin tip enables precise application. Protect from drying by plugging the tip after each use