Wollastonite is a major component of many of my glazes, but I hate the lumps that it forms, making sieving more difficult.  Does anyone have any tips on dealing with wollastonite lumps? Things I've tried: 1)Extensive mixing with paint mixer on electric drill - not much help at all with reducing lumps 2)Stick Blender - can work okay on thinner glazes, but too much cavitation with thicker glazes for it to be effective.  (Most of the glazes I am making are brushing consistency.)