Some time ago I tried Harbor Freight white and it didn't shake-n-bake very good for me. Today I tried some urethane matte black powder in some 2'' black plastic pipe like the '4'' PVC Pipe Thread' but I think mine was ABS and it was a nogo. I still had the rubber maid bowl with HF white ready to shake so I dumped the boolits from the pipe with the black urethane powder into the bowl with HF white. HF white is epoxy based and the matte black is urethane based. It was about 3 parts HF white and one part black.
It coated light grey and cured dark grey and had a nice even flow over the boolit during the bake. It even flowed over the bare spots. I just thought I'd post this because it seemed different and had decent results.
I tried a couple pictures to show them and could've have better light.