put stickers down first. dot all over then peel off the stickers before putting the mug in the oven! Make a custom mug with a sharpie marker THIS DOES WORK BUT YOU HAVE TO FOLLOW THESE RULES! 1. Let sharpie ink dry at least 24 hours before attempting to bake. 2. Place in cool oven. 3. Turn oven on to 350 degrees. 4. Once oven had preheated, set timer for 30 minutes. 5. When timer ends, turn oven off but do not remove from oven! 6. Let it cool 30min.