I got some of this the other day when I was looking for some Nickel Silver Blueing, and figured what the heck, I would try it on the "rock rash" on my Ross reel, and Voila - it looks like new. Most Blueing/blackening products are for NS only, or actually steel, but this one is for aluminum and such. Don't know how long it will last, but it sure looks perty now.