Why does Black Diamond mica powder settle in epoxy?
Black Diamond mica powders have a higher density than mixed epoxy products. This means that the mica powder will slowly settle in mixed liquid epoxy until the mixed epoxy begins to thicken as it cures. This still applies to thicker epoxy materials, though the mica will settle slower in thicker materials. When adding mica powders to slow curing epoxy materials, it may help to prevent settling by adding the mica powder at the very end of the epoxy's working time.