That's interesting, thanks. 
I had seen a lot of people saying the best way to prevent lead rot is to paint the figures, so I am surprised (perhaps naively so) to see that it doesn't actually guarantee it!
Hey, JollyBob,
I think I made several mistakes when I painted this figure way back when. It doesn't look like I primed her, because there is none around the base's edge. Leaving that bare, as well as the bottom of the base, was a mistake. I am not sure of the exact science, but evidently that gives the rot a "way in." I am not sure I got a clear protective coating over this figure, either; though that may not have protected the bare metal.
So I THINK painting a figure will protect it...if it covers every bit of surface. The other painted figures I showed in my blog post had paint all over them, except the bottom of the base - so there was exposed lead. But then again, the bloom showed up on surfaces that were painted...so it's still a bit of a mystery to me.
I am just happy that the 50/50 mix of pure gum terps and white mineral oil seems to get rid of the bloom (fingers/shoelaces/eyebrows crossed...).