One of the specialty chemical formulas used in firearm maintenance

Tetra Gun Blue & Rust Remover provides a thorough chemical stripping of rust and bluing from gunmetal surfaces. The chemical reaction begins immediately and prepares the gunmetal surface for either lubrication or a fresh treatment of cold gun bluing.

So yes, this is the recommended pre-treatment for Tetra Gun Liquid Blue treatment. This chemical surface treatment approach is much more thorough than just using steel wool, though based on circumstances, scrubbing in this way can be very helpful in freeing the gun metal surfaces of inconsistent bluing that would find especially in older pistols, shotguns and rifles.

Even though there is no better substitute for a full hot bluing treatment, the step-by-step cold bluing method can be completed with satisfying results. Cold blue is most commonly used for touching up scratches.

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