Paint pen or oil based sharpie,allow them to dry for at least 24 hours. Once 24 hours has passed place them in a cold oven (this is important! you want them to heat up with the oven). Turn the oven to 400 degrees and set a timer for 40 minutes.
All you need are white cups, sharpie oil based markers and to preheat the oven to 350 while the cups are inside for 30 minutes! Turn the oven off and leave the cups in the oven while it cools so it won't crack the mugs.
Use a Sharpie pen, draw a design of your choice on the mug or plate. Place in the oven at 180 F for 30 minutes. Leave to cool completely before washing or using. Effect is permanent and safe. Love this idea! Great way to personalise a gift!
Tips and Tricks for Sharpie Marker Mugs. A must read if you plan to add a sharpie design to a mug! Lots of great info. Sharpie marker mugs - dollar store mugs with sharpie markers. bake 350 for 30 mins to seal