Hi, If you mirror polish your stainless fasteners, they will look more acceptable, especially if subsequently heated up with a blowtorch, when stainless will then take on a slightly yellowish tint, that is very difficult to separate visually from nickel. Try it on one or two bolts, and if you don’t like it just repolish it to take away the colour. If you talk to a supplier of metal polishing supplies they will gladly tell you what kind of mops and soap to use on stainless steel, but smooth away any machining marks first, using emery cloth, or you will take forever to get a mirror shine. Your polisher motor needs to be at least half a horsepower in order to get the job done reasonably quickly. There are plenty of videos on the internet showing how to polish various metals. Always wear eye protection, a dust mask, and thick leather gloves.