I am looking for suggestions on perserving mild steel so it will not rust, but with a clear coat finish. I use a welder to draw on sheet metal, then I use torches, grinders, and polishing wheels to creat colour and texture to the drawing. I have been using a spray of automotive clear coat to protect the finish work from rusting, but I am looking for other ideas, I am not sure how long the spray will protect the art. any suggestions appreciated