there is most likely a spiderweb of rust under most powder coating, but if the powdercoat is opaque, you can't see it. The spiderweb is only a problem if the powdercoat starts coming up because of it.

I have seen a report of the rust under one of the clear coated bromptons. Those frames are sandblasted before coating, so that rules out sandblasting as a cure. I'm curious how the Vanilla clear coated Speedvagens are holding up. haven't heard anything about them.