After a good part of the night and most of the day, the rear axle was de-rusted and now looks halfway OK.
It is much more than a pita to do than the front axle, because rust it is mostly inaccessable with power tools. The only way is to manually brush and scrape the rust off, and you need to be in good physical and mental shape for doing it.
This car is not even five years old, and the last time I did it was only a year ago!
Here some pix before:
PIX AFTER:
EDIT:
After treatment as above, both axles were painted over with the same sort of paint as used for painting steel bridges. That sort of paint has a much higher viscosity than rattle can paint, and consequently results in a much thicker layer. After the (salty) winter, both axles look freshly painted and perfectly rust free.
For front axle see:
https://mirageforum.com/forum/showth...usted-many-pix
qwert