Hi again guys. I just finished buffing some cast brass 2″ letters and numbers. They are from my mail box. Have been exposed for a year, and were very bad looking. I had sprayed them with clear Krylon paint, and then occasionally with some spray auto polish. I don’t think any of them done any good. I live in Tx and the sun is very intensive. Might have caused some of the problem. Any help from you guys will be appreciated. THANKS!