dude, stencils are soo easy, but they dont work as good on a helmet (its round). normally, youd just use tagboard and a good exacto, but if you wannt stencil them, lay out some masking tape on the helmet, draw it on ther, and then cut it out. and i would suggest polyurathane or urathane clearcoat. its alot more durable than just clear spray paint. the helmet from full metal jacket would be soo dope. you kinda have to go army on it, cause anything else would look gay on a helmet designed after the army lids.
I.L.I.A.G.A CREW!
I drink pepto bismal like its water.. -PJO