Opaque, water-based glass and porcelain marker suitable for glass, porcelain, metal, and dark ceramic. After drying for 4 hours, bake in an oven for 90 minutes at 160°C (320°F). Dishwasher-safe after baking. Fully opaque, water-based marker for glass, porcelain, dark ceramic, and metal. After curing in the oven, the item is dishwasher-safe. The marker works best on a clean, dry, and grease-free surface. Shake the marker well before use and gently press the tip a few times to allow the paint to flow to the tip. To prevent the color from bleeding onto vertical surfaces, it's a good idea to trace the design with a contour marker first. Let dry for 8 hours and then place your artwork in a conventional oven (not convection or steam). Set the oven to 160°C (320°F). After 90 minutes, the paint will have hardened. Let it cool completely in the oven.