Create chalkboard on glass, ceramics, wood, metal, rigid plastic, fabric, canvas, paper, terra cotta. Durable, weather-resistant. Waterbase. Non-toxic. Dishwasher-safe. For best results, at least two coats are recommended. Apply first coat; let dry one hour. Apply second coat. Cure for 24 hours. To cure on glass, air dry for 21 days or bake, following these instructions: Air dry for one hour, then place in cool oven and heat to 350°F; bake 30 minutes, cool in oven, and then remove. Do not use in direct contact with food. Lightly rub chalk over surface to condition. Clean up while wet with soap and water.