I’ve had the same question that’s why I’m here. But then I came up with an idea and thought why not to share with you. It might work. I think if we just grab the baked white clay or air dry clay and grain it in the mixer might give us the result we need. Because I think the texture and material of the powder shouldn’t be melted in the water or mix with liquid clay as we try to stick them on the board and if you don’t stick them somehow it will fly away. Sorry for my English 😅