polishing powders ?

Is this what you're looking for?

http://www.uschivdr.com/products-in-detail/polishing-powders-metallic-pigments/

Up until a few years ago, there was also SNJ metal powders, but they have been discontinued.

Wow! That is good stuff, Phil_H !!

There are a number of non-modelbuilding materials that can be used for polishing, depending on the grit you want. I have used toothpaste a lot on models.  Pumice stone used to be a popular very fine abrasive.  Another is jeweler's rouge, though I would think that might stain a bit.  Baking soda is a very gentle abrasive.

Perhaps a bit of ground pencil "lead"? 

that's the gear phil-H, thank's mate , might have to try that pencil lead texgunner , don't see why it shouldn't work

steve5