DFX red coverage

This past weekend I did an event that turned out fairly slow for me, but toward the end it picked up a bit. One of the few faces I got to do was a spiderman mask, and it was for a very dark-skinned boy from Nigeria- and such a good boy. He sat so still- even though I took a bit longer because of an issue I was having. And, he said it was "the coolest ever" when he saw the finished product! The issue I ran into was that the red I was using (Diamond) was quite translucent on his skin. I ended up covering in white and then putting the red on top of that to get good coverage- but I found when doing this that it is difficult to keep them from mixing a bit on the brush and coming out with a few strokes of pink. Has anyone else had this issue with DFX, or is this maybe true of all brands? or am I doing something wrong? (I am still quite new after all)

Thanks!

Dark colors don't show on dark skin I have same problem with some hero mask like wolverine, batman, etc, I do use metallics but I also discover that silver it is my best friend, I applied it as a base and then the color and it pops some times better than metallic color itself. ( I have a dark skin).