I just did some handpainting on my daughter's cake and only had the Wilton petal dust--the Blue and Pink--mixed with vodka, and it was still very streaky. I know Wilton isn't the BEST luster...what would have been better? (Its the only picture in my profile--the darker blue and pink stripes are the painted ones)
I don't think it looks that bad at all - (the streaks, I mean). The cake is adorable, very well done, and the colors look better then I thought since I wasn't aware that you could dilute Wilton dusts.
I use them often but only dry for brushing chocolate, etc. I use CK or Sunflower brand if I need petal dusts. For painting, I use airbrush colors, only because I am lazy and prefer to just add more "paint" from the bottle instead of having to mix it each time.
The cake looks amazing. I've used the FDA approved dust and it still streaked.