You want to make sure that you use an ink or coloring medium that is not water soluable (sp?). Palette ink, stazon, sharpies, some chalk inks (pigment based inks), Fabrico markers/ink, all purpose inks and brilliance or some of the ones that I have used a had success with.
Be careful to heat set in between colors to keep then from running together...especially the black ink. Som epf the things listed above wont work well together...such as stazon and sharpies.
Do a final heat set in the oven when you have yourproject complete.
Different sealers will do react to different inks..some will run but off the top of my head I am unsure of which brands react with which inks...
There is a leanring curve but I think it is minumal
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Good luck ;)
Marbled Tumble tiles are what I buy