Scotch Brite
Alodine
Thouroughly rinse
Zinc Chromate paint.

Udo Rumpf wrote:

I am refurbishing an Schreder trailer.
The under side has white corrosion markings all over.
I would like to know if I can apply an oil spray of sorts
that would "stabilize" the oxidization and help protecting
the under side over time with repeated application if necessary.
If that would work what oil?
Thanks for any informed reply.
The top surface I reconditioned with a fine Scotch Brite and it came out
OK.
Regards
Udo