I am somewhat confused by your question, so can you clarify what information you are interested in obtaining?  Are you looking for more information on suitable solutions used to electropolish stainless steel?  If this is what you need, then I can provide you some details:

Typical solutions use sulfuric and/or phosphoric acid electrolytes at somewhat elevated temperatures (>100 F) at widely varying current densities (from 20 Amps/square foot to 1000 A/sq. ft).

A good article with more details was authored by Kenneth B. Hensel in the January 2000 issue of Metal Finishing (Volume 98, Issue 1, pp. 440-448).  Kenneth works for Electro Polish Systems in Milwaukee, WI, USA.  A link to their website is included below:

http://www.ep-systems.com/index.html

If you need some other information, please post the question again.  Good luck.

To TVP
Thanks for your answer and sorry for the confusion. I already know the electrolyte mixture and it is as you say plus the addition of a propriety material. However, I have been told that after mixing in the right proportions ( which is no problem) the electrolyte has to be "plated In" with stainless steel and the solution should be fully worked to a minimum of 30g/l iron,nickel or steel content.
I presume this means that I should use the solution at a low current flow until this is achieved. Am I right?

Now I understand your question.  The terminology "plated in" or "plating a solution" is what was confusing-- really a problem with English grammar more than a technical problem.  Anyway, as an answer to your question, yes, one way to "plate in" the process would be to use the solution with minimal current flow until the solution attains the proper iron content.  The desired outcome is to have a certain amount of iron (or nickel, whatever the case may be) dissolved in the acid/electrolyte solution to maintain some type of equilibrium condition, which will reduce process variability.  Good luck.