I have done quite a few bbls with the Mark Lee soln also. You do not need to "dip" the barrels in Copper Sulfate soln. just swab some on and leave about 10 min.I then lightly steel wool the bbls. Do not dilute the Lee sol'n as it is fine as it is. If you are trying to get Browns, heat the barrels slightly with a propane torch before the steel wool scratching to help turning the ferric oxide into a browner ferric oxide.
I would also suggest a scrubbing with 10% Ferric Chloride soln after the last pass or two to bring out more contrast.Use gloves with the FeCl as it is nasty . e mail me if any more comments are needed.
Below are two barrels that I have done with the Lee soln.
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