I don't think so. We've done that before, designing them with porcelain markers and it worked fine. Depending on what you use to design them--I just sealed mine with a sealing spray (from Krylon). I've seen some DIY coaster projects where people bake them to seal what they've designed on them.
I have white subway tiles floor to ceiling in my bathroom and decided to paint them... they are glossy... I got the enamel paints and painted a border on them. The first time I used the enamals and a sealer on the tiles. After drying I could wash as normal and the paint was fine. I decided to change the look and I took a Mr Clean eraser sponge to the tiles and after some work they were clean again. I then stenciled a design on the middle row of tiles with enamals, no sealer this time as the last time it yellowed. Tiles have been painted for 5 yrs now and are perfect. I also painted the white backsplash before I installed those tiles and followed the instructions to bake the painted tile in the oven. So check the paint and follow the instructions, and I have never dulled, sanded or changed the tiles before painting them...
Thanks ladies, I was thinking about using vinyl decals and sealing with a sealing spray, I am hoping it works, it is a christmas present for my brother.
You can use modge podge to seal them. I used it last year over pictures. They turned out super cute. And it held up really well until we left a ice cold water cup sitting on it over night. Then it left a cloudy ring on it.
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