I know what you mean Sean,
My tank is exactly as your is, fresh chrome. The only thing is my chromer did not care about polishing the copper dead flat around the fill hole. I can see slight low spots and whatnot around there.
I have a friend investigating a new primer, it does not appear to be on the general market yet (I have looked). supposedly you can paint this onto freshly cleaned glass, and cannot power wash it off. The company is trying to come up with a "no sanding/ grinding" prep for chrome. Chrome is not in style right now in our custom car world, and everyone is trying to find a way to cover their chrome in very expensive paints (flip/flops, chameleons, huge metalics are coming back). This company sent him some samples, he is going to try it on some old bumpers he has laying around. If it works thats how I will prep my tank. I will let you know if its any good or not.
A solid chrome tank does look awfully nice in the mean time....
Lee