Mike I use a product called Blacken-It and have used Gun Blue as well. The Blacken-It seems to work the best on Kenny Kongs tracks and the Impact tracks as well. Most HobbyTown USA's carry Blacken-It. Just Google it. I think Micromark.com carries it as well. Here is what it did to a set of Impact Panzer III Tracks and Asiatam drive sprocket and idlers.