I making some tiles right now for my Saturday show, actually Farmer's Market where I am artist of the week. I sold majority of my tiles on few previous shows, so I need new ones
I don't own copics, but I have Prismas, I color my tiles with them and I love how they come out. After that I seal the tiles with acrylic fixative.
I have my first tile I have made at home for testing, I have run it through water, hot and cold, washed it with sponge and soap, put hot coffee, cold ice cream. The tile is like the first day I made it.
I love the results and I have sold quite few of them.