1. Question: Are the wells sloped?
Answer: No. I would say softly squared.
2. Question: What is the weight of the 14-well circular palette?
Answer: The Weight of 14-well is 540g.
3. Question: Is this dishwasher safe for cleaning after use?
Answer: Yes, but if you are using cobalt or cadmium paints I would not, as you do not want any of that residue on your dishes.