Anyone on here do any DIY gun re-finishing? I started to re-blue an older Mossberg 500. I used a cold bluing kit by perma blue. The barrel and magazine tube came out great. I didn't realize before I started that the receiver is aluminum. You cant blue aluminum. Anyone got any ideas? I guess I could just paint it but would that hold up when you put gun oil on it? I was thinking of having it powder coated but I really dont want to drop that kind of money. What you guys think?