With the tumbled tiles - if I am stamping with stazon and then coloring in I usually heat my tile with the embossing gun for a few minutes to set the image and then use Sharpies to color in.
After that I usually bake it in the oven - I have done a variety - every where from 200 to 350 degrees and everywhere from 10 minutes to 20 minutes.
If I am just stamping with Staz-on I just stamp and bake (my gallery has a few examples of staz-on only tiles)
After that the image is set - I had a instance where one of my daughters scribbled over a coaster with ink pen and I used that as a test surface and used a variety of different cleaners - the only thing that made the image budge was a solvent based cleaner like nail polish remover (not something you are going to be routinely using to clean with) and even that just lightened the image and didn't make it go away. But washing it with soap and water, or useing Lysol cleaner, Windex, etc.. is not going to budge the image.
The only time you would want to think about using a sealer is if you color in using pastels or pencils.
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