I have had some succes

[lsharik]

  I have had some succes with mixing bullseye crystal clear powder with mica powder before fusing. I am doing glass casting though so the powder and mica are mixed with gum arabic to hold them in place in my mold. But I do get mica IN my glass piece not just on the surface where it only adheres in places. So you might try mixing your glass powder and mica powder and see.

Lisa S