there are 3 ways to do this:
easy - and surprisingly efficient: good old elelctrical tape and a razor blade
better - plastidip black - or smoke - 4 coats - lots of taping up to spray, but easy
also better - the $20 vetteFX strips - cur for it and easy as stick on....
all these are reversible too, no perm marks...and why I don't recc paint.
When things are $20, I vote easy - VetteFX.com
once again, how OCD are you? you can't see the diff in any of these by a normal person looking down, if you get on your knees and eye it a foot from the strip, you can find deficiencies...