I've been looking into this Sharpie+mug+350 degrees craft and it looks as though many people have been experiencing fading or the colors coming off altogether. Therefore, I would like to share this blogger's page. She explains to the tee how she cooked her mug at 425 for 30 minutes and then left the mug to cool in the oven. The results: a permanent cup at last! Check this out!
Copper-Topped Patio Table | This simple trestle-style table was built using pressure-treated pine. Then, painted French Gray by Farrow & Ball, the table seats 14 and measures 17 feet long. That length made it exactly 1 foot shorter than a standard sheet of copper, allowing the roofer to easily wrap the tabletop in the material. | SouthernLiving.com