painting the inside of an overflow (with solution!)

[lastlight]

You guys don't BELIEVE? I will keep the back black I tell ya

I think at this point I'm goin to paint it again and then silicone a piece of glass up against it to keep it dry. My other idea is to apply a layer of black silicone to the whole surface so it instead matches the 'black' of the silicone outline you can currently see faintly.

The problem with a piece of acrylic is I will see all the silicone holding it in place. I am FUSSY =)