Hey, I had this new American made full cat back installed at a local shop. They used 3 new hangers, and welded all connections, and hanger supports to the main pipe. Sounds mint. Its also new car tight. So to keep this for a winter I've decided to paint the new exhaust with flat black high temp 600?F. Question is what is the permanent solution? I want to keep it rust free. I did all the welds and main pipes with the muffler. It even looks great. Repaint every 6 months? Forget about it? Thanks!!