Welcome to the forum !
Cold bluing compounds will start to wear off the more the model is handled. Some compounds are worse than others but, eventually, re-doing the process again is inevitable.
Once I find the photos, assuming they're in my files, I can re-post several photos of metal modelguns that have been lightly sprayed over with metallic paints after bluing. If I don't have them, hopefully the member that put them on here will re-post.
Photobucket's recent actions stripped shared photos from forums and elsewhere worldwide. It'll take some time to restore everything I have on file.
Hobby collector of Replica model guns and Militaria.
also member of Living History Reenactment Groups.