I wouldnt use it. Get duplicolor clearcoat. Its in a spray can and u can get it at auto zone, napa etc...I have used it for similar sized parts and worked really well.
Tell him audio or drugs. You could be doing stuff alot worse than messing with car audio. Ask him to talk like men and let you argue your point about your hobby vs. other things you could be involved in. See how that works.
I wouldnt recomend using it. It can have alot of affects on people around you not just the person or persons you want to use it on, if its windy or inside somewhere. Maybe go with a stun gun