For oil-based markers, we recommend allowing 24 hours to cure. For water-based markers, to make your finished item top-rack dishwasher safe, let it dry for at least one hour, then place it in a cool, unheated oven and set the temperature to 350°F. Once the oven reaches temperature, heat the item for 30 minutes, then turn off the oven and leave it inside until it has cooled completely.