header wrap? pro's / con's

At this point I'm all fired up and ready to go I'm just not sure if I should paint it with the silicone crap first and let it dry or just clean it wrap it and then paint the silicone crap over top of that? Only have one can so I think it probably only got enough to do one coat on each set of headers?
Of course thank you for any help!
I f ur talking about me, no I don`t. I can`t seem to find the right way to post pics. Not that I`ve tried that hard !