Like everything else ..... more than one way to skin a cat (or paint a track).
For all metal tracks this is the method I use.
- base coat of gun metal
- dry brush of rust
- dry brush of steel
- burnish with ground pencil lead
- dust with pastels with the rest of the tank to finish
For tracks with rubber blocks
- base coat of flat black
- paint metal parts gun metal
- dry brush metal parts with rust
- dry brush metal parts with steel
- burnish metal parts with ground pencil lead
- dust with pastel to finish
Happy Modelling and God Bless
Robert