I've looked at this electropolishing thing many times over the past few years, with a view to making up a small kit, BUT - it ALWAYS comes down the same things.
1. The use of concentrated nitric acid and other unpleasant chemicals make it have serious liability concerns for us at Caswell Inc
2. The power requirements are similar to chrome plating, 1-2 amps PER SQ INCH of surface area.
3. Fume emissions from the tank need to be controlled properly.
4. If you are doing this on an amateur level, for the occasional small items, then the risks and costs are simply outweighed by standard buffing and polishing.
5. If you are doing this on a semi-professional level, with larger items, setup cost is horrifying, not to say anything about EPA concerns.
6. Whilst it would be great to be able to do this electropolishing, I personally think that using a vibratory tumbler and various tumbling media will give you excellent results, at a fraction of the cost, and more safely.
See
http://www.caswellplating.com/buffs/...y_tumblers.htm
So, thats my 10 cents worth! However, we're always open to suggestions and don't have blinkered vision.