I tried to seal one with polyurethene, and the alcohol ink promptly smeared. So I added three layers of ModPodge before adding three layers of polyurethane. Then it didn't smear. (I used leftover polyurethane from one of my dad's woodworking projects, the kind you apply with a brush. I wanted something I could do indoors.)
Now I'm waiting 7 days before putting the tiles through a series of tests, including grape juice and boiling hot tea. Once I know what works, I'll do a tutorial.
Stay tuned!
Good luck! ~ CMW
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