OK, got the aircraft stripper...accidentally oversprayed a bit onto a tool box, and it took the paint of that in 2 seconds. It's working on the bike, though not quite as well. I'm applying thick coats with the spray, and letting it sit, covered, for a few min, and getting wrinklage, finally! Still leaving bits here and there, so I think this is going to take the whole can.

The bike does have an interesting primer on it, though..bronze colored, metallic sheen, between the paint and the grey steel. Anyone know what I'm seeing?