Break Free CLP as well as RIG has worked very well for me over the past 30+ years here in Montana. Then again we are NOT a very moist or humid climate either.

On the Highway Patrol we issued Break Free as a "do all" weapons lube/preservative. We carried rifles and shotguns that were often exposed to tremendous temperature extremes as well as snow, and rain. Once we started using the Break Free our rusting problems were over.

Personally I use RIG for REAL long term storage. But if I was forced to use Break Free CLP I wouldn't lose any sleep over it.

FN in MT