Matte black paint is only useful if you spray the outside of the body. You are far better off to just paint with regular gloss black on the inside, then scotchbrite the chit out of the outside and cover with a coat of matte clear to achieve a matte finish.
Thanks guys.
I guess because this is a begginer painter thread, I should have added that I find the airbrush to actually be a better way to paint vs rattle cans. With rattle cans, it's kinda hard to do nice even light coats, which as Heisenburg stated is pretty key. You want the first coat to...
I use airbrush paints for my bodies. This is Createx paint.
It is a little harder to work with the Createx paints because you have to layer it on in very light coats to get it to stick properly. But it works great.
Another brand I use that is specifically designed for poly bodies is Parma...