hi, i probably wouldn't just use primer. goto your local paint supplier and ask them. they sould be able to mix you up a matte black in acrylic enamel or acrylic urethane. if you can, go with the urethane. most of them even have color samples. if they cant do this for you then goto www.smartchoppersinc.com. order house of kolor ub04 and ku100. its a 2:1 ratio, this is their single stage polyurethane black. then order some flattener fa01. according to the hok tech manual, 16oz. of flattener per ready to spray paint will give a 99% reduction in gloss and 12oz. will give 95% and so on.
I wouldn't recommend primer either, it isn't designed to stand up to weathering, staining, etc. I painted a SAAB with a PPG Base/Clear and added flattening agent to the grey parts of the car. It gave a nice flat finish that went well with the glossy black the rest of the car was painted in. Talk to your paint supplier, they can give you way more choices that will suit your needs. Most paint suppliers have paints designed for military use that are flat. (Camo colours, including black)
Once again I will say John Deer Blitz Black. I just put the top back on my Blazer (K-5) today after letting it sit painted since last weekend. The color is a real smooth suede black. i am really impressed with this stuff. And the price is the best part
1 gal JD Buff primer
1 gal JD Blitz Black
1 gal JD reducer