[AJD] metal coating

[Michael Ostrander]

I am looking for suggestions for a material to cover cast iron that has the
following properties:

- thin- minimum thickness
- rust resistance- thin covering but will not rust
- low maintenance- do not want to have to recoat every 6 months
- coloring- either clear or black, or dark
- adherence- will not adhere to the mating surface but will let both pieces
move as needed

I thought about the material used on gun barrels but do not know anything
about the material.  Paint is always an option but thickness of primer and
top coat on sliding parts could be an issue.  Oil will collect dirt and that
is unacceptable.

Any suggestions would be welcomed.

Thanks,

Michael

p.s.- before i get jumped, this is for an antique john deere tractor that
has wiggle room around normal color standards.