No, I prime the miniature black, then spray white primer over it from the top. I have also made a video on the subject a couple of years ago: https://youtu.be/9wLS8jRnijg
And please check out the rest of my videos, there might be other useful stuff in there too
Indeed, I do not use much of the black and white gradient effect of the primer. But it might show through a bit, who who knows
I try to cover everything, even the black areas. But if there are areas which I cannot reach (for example underneath the bed of the Guilty figures), then this will be black already because of the first layer of primer.