Looking for best way to paint or weather Fruil tracks.

Are you looking to use a rust type heavily used look, or newer with a gray colour, or a somewhat dusty look? Try using a gray, or black, the DRY brush over it with a little rust, or the colour of your choice.

~ Cobra Chris

I do airbrush, oil washes.

Watch out Chris, the "tracks don't rust" group has been sighted at their assembly points...

Thanks guys. I'm not looking for a rusty look.  I've read a bunch of places that German tracks didn't rust all that much anyway.  This will be a pretty weathered tank though.  I'm shooting for early Barbarossa look when one of these tiny tanks still was used as a scout vehicle.  I like the color of the vellejo track primer.  Combined with oil wash it ends up looking better than mixing black and brown etc.  It's a dark reddish blown black. Hard to describe.  

anyway I'll try drybrushing and oil washes.  for my panzer II maybe I'll use a blackening agent and do the links separately to get a uniform color.   I'm working my way from the earliest to final German armor of wwII. 

I like to basecoat in a Rustoleum dark brown color from their "Camouflage" line. Using washes and a sponge spotting of various acrylic rust shades lends an accurate appearence.

I drybrush the high spots with MM Enamel "Jet Exhaust" or MM Metalizer "Dark Anodonic Gray". Sometimes I use both. I will always use the Anodonic Gray for the highest spots. It looks like polished steel.   

pemihiker

So I pained one run with Vallejo track primer and they look great but but it rubs off pretty easily. Maybe I should coat the paint with matt resin?

Did you prime the tracks before applying the Vallejo track primer?  Vallejo is extremely fragile unless it has a good primer coat underneath.