I made a sharpie mug for my cousin for his birthday. Well I had a bit of trouble, so I made two. The first one I made had a thick gloss and I had followed the instructions from pinterest, I baked the mug for 25 minutes at 375 degrees Fahrenheit, I let the mug cool completely in the oven, then I tried washing it. The Sharpie came right off! I had washed it with water only, and I had used a hand-knit cotton dish cloth. So I went searching on the internet for some more Sharpie Mug tutorials. They all we about the same. So I combined what I had learned from them together to try another mug.
First you HAVE to use a chep-O Mug from the dollar store. The glaze has to be light/thin. So not supper shiny. If the cup looks dull then you're good to go.
Second you HAVE to wear gloves. Why? Because you need to keep the oils on your hands from getting on the mug. The oils will prevent the marker from fusing with the glaze when baked.
Third you HAVE to let the marker dry for at least a full Twenty-Four hours. The market bakes better when completely dry.
Forth you need to bake the mug at 400 degrees Fahrenheit. The higher temperature allows the glaze and sharpie to fuse better.
Once you have your mug then you need to pick out you design. When you are ready to draw the design on your mug you need to pull out your markers and set up. Put on some gloves (rubber, latex, or latex free. No cloth gloves). Now you need to clean the surface of the mug with Rubbing Alcohol. Let it dry, it won't take very long. Now put your design on the mug. Let it dry for at least twenty-four hours.
When you are ready to bake your mug, place it on a baking sheet. Place it in the COLD oven, then turn on the heat. Let it bake for 25 to 30 minutes. When it is done baking DO NOT remove the mug from the oven, because it might crack. Allow it to cool in the oven, until the oven is cold.
Once your mug is cool, if it seems like the Sharpie might was off, you can bake the mug again.
Now your mug is done! YAY!!
The sharpie will ware off over time. The mug must be washed by hand or else that Sharpie could wash off. There's a chance it won't wash off in the dishwasher, but if you want to be safe just handwash.
Here is a picture of the mugs I made. Good Luck if you choose to make one yourself.