Thanks for your opinion on this being a warranty issue or not, I wasnt asking you that. The gun is six months old and if thats the "quality" s&w puts out, its sad.
With all due respect, a blued gun will rust overnight if exposed to bad conditions and not properly cared for. In a salt air environment, a wet, humid environment or a seaport, or on a boat, or if exposed to salt water, or if exposed to perspiration, a blued gun can literally rust overnight. On the other hand, if left in a dry, low humidity environment, it can go for a long time with little care.
It has absolutely nothing to do with quality of manufacture. It has to do with blueing, and the fact that a blued finish requires care.
I am sorry to say that firearms rust because of neglect by the owner, not because of quality of manufacture. On the other hand, a blued firearm does not have to rust, if given care equal to the conditions to which it is exposed.
I have seen many revolvers used as holster guns carried out in the open subject to the environment or closer to the sweat and perspiration of the body by detectives for an entire career that have absolutely no rust on them because the officers who carried them actually maintained them.
I am trying to be sincere about this when I say that perhaps you should either plan on appropriate maintenance; or, if you are not able or willing to do more maintenance, then get a revolver, such as the Model 642, which is more forgiving of user neglect because it has stainless steel parts instead of blued carbon steel parts like your Model 442.
If you like your 442, then another option is an aftermarket finish by a reputable company such as Robar or Walter Birdsong's Black-T finish or something similar (not a spray can do-it-yourself) from one of those online companies.
Again, to blame S&W because YOUR revolver rusted in YOUR possession betrays an unfortunate misunderstanding of your role and responsibility in the care of your firearm.