Por15 isn't just for gas tanks.
I painted the belly of a '58 Caddillac with it when I worked as a gopher at a restoration shop.
I'm going to do my frame's sensitive bits in something tough like it, or Rhino-liner, Line-X etc to stop it from chipping. Motor area, chainstays, seatstays, sidepanel insides, center stand.
The current coating is enamel and it's brittle as hell.
Nice colour, but fragile.