Oops, sorry, im on phone: use tape to cover up anything you dont want to be painted(the ear flaps, the straps, metal studs, brand logo's etc). sand the helmet as much as possible, you need to do it more than you think. Put a layer of primer on, let it dry. Put a layer of whatever color you want, let it dry. Now get some matte clear coat and spray it down one final time. Good luck!
"If I ever see kids who just don't understand newschool skiing and hate on skiers I just kill them, plain and simple. Take my gat, put it on their domepiece and BANG!" - Marshall.