Thanks to some of our members I've seen a couple of recent threads explaining the best ways to apply cold bluing to steel.
I learned that warming the surface after degreasing will help get better results.

Any tips on the best ways to apply Aluma Black to anodized aluminum frames ? On older Airweights and Cobras the gripstraps really take a beating, finish-wise.
I am aware aluminum frames that still retain the anodizing will not suffer from lack of surface finish as dramatically as steel frames will without finish on it.

Thanks in advance.