The empire copper tanks all came with a lacquer clear coating. Granted its all gone now after I dipped it with acetone and polished it. I bought some Everbrite ProtectaClear off Amazon. So before I put this one away I am going to remove the tank again, polish it again as best as I can, use some denatured alcohol on it and coat it. If that happens to turn out well I do the same with my Empire 90 and 92, which always came out as copper tanks (as far as I know).
The Chinese variac is pretty cool, cheap off Amazon (I think it was on sale too). I'd love to get a REAL
VARIAC but even the used ones are costly.