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I have used the Radocy Rust Blue Express on small parts. very time consuming, but produces a superior finish to that of any cold blue.
The final blued (almost black) finish is very hard - perhaps even harder than caustic salts bluing.
Although I have not done larger parts, I've seen some of Paul's barrel samples where he used the rust blue solution and just a heat gun - carding with steel wool between treatments of solution. Very nice even finish.
This is not beyond the skills of most DIY's - just lots of elbow grease (carding) between solution applications. If you go for this, please show us your results
This is not beyond the skills of most DIY's - just lots of elbow grease (carding) between solution applications. If you go for this, please show us your results