DIY Sharpie Ceramic Mugs and Cups - Who Needs A Cape?

DIY Sharpie Ceramic Mugs and Cups are such a fun family project. Let the kids decorate and give as gifts, they'll be a treasured memento. I have seen this pinned many many times on Pinterest (including pinning it myself!). It sounds so easy and awesome. The only problem I've read over and over is that