I purchased a bunch of Copic Markers to do my drawings with and I’m so happy to see this, now I have something else I can use my Copics for. That cup is beautiful and I can’t wait to try the markers on my own tumblers. Thanks.
I saw your email. Yes, sand it down and start again. You do want it to be flat and smooth. The can may not be shaken well enough or it could be the brand. I love rustoleum.