you can't do a black marblizer, that I am aware of. Most of the marblizers are silver, red, green, yellow, gold, blue, that kind of thing. They are intended to go over a dark colored basecoat. The lighter the color of the basecoat, the more invisible the marblizer becomes (not always, but in many instances this is true. it depends on what marblizer you are using over what basecoat) You could do a black base, with a silver marblizer. It will essentially look black with a silver marblized effect. A black base with a blue marblizer might look cool, then do the blue flames.
HOK sells the marblizer. There's not much more to it, really. Spray the basecolor. Do your tape outs or whatever, to expose the portions you want marblized. Spray the marblizer (no reducer or anything, you pour it right out of the can and spray it), then wait for about 60 seconds and lay saran wrap over it. Burnish lightly and quickly, and remove. You need to topcoat the marblizer with HOK SG100 intercoat clear, or it will all lift. I usually remove the tape, THEN spray the SG100, it helps smooth out the edges where the tape lines were. You need to play with amount of marblizer you put on the surface, as well as the amount of time you wait before you lay the saran wrap down. Too much marblizer with not enough "flash" time (+/- 60 seconds) will cause "runs" in the marblizer. Too little marblizer with too much dry time and you won't be able to get the marblized effect, and will have to re-wet it or worse, re-spray the base. heck, call me if you have Q's, 704-607-9153, 7am-10pm EST
Bryan