I have used the electrolysis process if that is what you are talking about. It works great, but it will not remove any pitting that is under the rust. It has to be pretty rusty before I put it in the bath, firearm wise. After coming out it has to be brushed with a brass brush etc. I might try a less intrusive method if the rust is not real bad. I have not noticed the process itself destroying the finish. Usually the rust and neglect has taken care of that. Got an 1891 Argentine working in there right now. Now this baby was a real mess.