This video by Brownells' "Smyth Busters" (Caleb Savant and Steve Ostrem) directly addresses the question of whether cold bluing is as durable as traditional hot bluing. The experts definitively state that cold bluing is NOT as good, explaining that the high heat in hot bluing creates a more durable black oxide layer. Cold bluing, applied at room temperature, is a surface-level chemical reaction that wears off easily and is primarily recommended for touching up minor imperfections rather than finishing an entire firearm. They mention specific high-quality cold blue products like Oxpho-Blue®, Formula 44/40®, and Dicropan T-4® as suitable for these touch-up applications.
This video by Kit Badger demonstrates the use of Birchwood Casey's Perma Blue Paste for touching up bluing on firearms. The presenter highlights its effectiveness in repairing scratches and worn areas on pistols and rifles, and its utility for protecting newly exposed metal after machining work on a Glock slide. The video aims to provide a practical solution for firearm maintenance and refinishing.
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