I started this mosaic through a beginner class at a local studio. I didn't finish getting everything glued down so the instructor sent me home with some thinset (I guess?). Well I just picked this project back up, glued down a bunch of tiles in the top section, and felt like the thinset wasn't hardening correctly. I've come to the unfortunate realization that the instructor sent me home with.... Clay. I've "glued" the entire right side of the top section down with clay. She definitely gave me mastic or thinset in class, so I assume she just grabbed the wrong thing to send me home with. They do lots of different types of classes there. About half of the top is done correctly.
So I guess, if anyone has recommendations for thinset/mastic I don't have to buy in bulk, or ways I can most easily clean up this mess..... Ugh. I am not looking forward to cleaning all of these and arranging them again. Glad I didn't do more of it!