According to Chemical Safety Facts, acetone just smells bad but you'd need to take a bath in it for it to affect you.
I was avoiding it but realized there has to be a MSDS for it and it turned out I should use it. I also noticed that out of several containers of Goo-Gone, Goof-Off, etc, one worked great, and it smells a lot like the acetone does.
You can see a few places where I rubbed through but it seemed like it was thin there to begin with. Or something. No matter it's less ugly now. I will need a can of B5, hopefully there's a local paint supplier that can mix and put it in a spray can. I'm not going to go crazy sanding priming and all that. It will be fine.
The firewall is going to be nothing short of a PITA though. It seems like it might have been sprayed with different paint than the aprons and yoke.
A lot of the sloppy stuff right under the fender was me, gobbing rustoleum on that flange. I'll do a little better on that before I stop, if not the spray bomb will hide it. The top of the apron on the other side was sanded and primed with hot rod red before I got it. The primer there was me ugly fixing some rust that is never going to be seen again. I ground it back to rust-free, and welded a patch over the hole and then welded the edges to the patch. The battery and the headlight bucket hides it. Good enough.