I recently bought some R32 GTS-T rims which needed a bit of TLC.
One in particular had a nastyish chunk in the outside lip Approx 15mm wide and 3-4mm deep.
Bought some "Selleys Steel Knead-It" and filled it up, sanded and painted them.
I can't remember which rim was damaged now cause they all ended up looking the same.
I wanted a Bronze colour but couldn't find one so I got a Copper colour and did a light mist of black over the top.
I think they came up pretty damn nice indeed.