Kiddiekakes, it's interesting that you find marbling the candy easier than dusting a solid color. I used to do the marbling, but then discovered that dusting the solid color was EASIER!
I've never tried dusting the mold before pouring in the candy. Seems to me the cavities (molds) would need to be cleaned between each color change. Sounds like extra labor. Not that I mind it if I get a good result, but this extra step involves CLEANING! *runs away screaming*