I have used Birchwood Casey Rust and Blue Remover for a long time to remove rust and old parked finishes on smaller parts. But I haven't used it on bolts, receivers or barrels - fearing that using it on these parts would cause hydrogen embrittlement. I know this product is a very weak phosphoric acid so I doubt it would, especially since it is sold to do just this. But what do you all think? I have also used Evapo Rust to do the same thing, but although it will remove the finish, it doesn't prep the metal like Birchwood Casey does. Is Evapo Rust safe to use on receivers and such? Thanks.
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