Thread: birchwood cold bluing turning to rust one week later

I have been trying to touch up a rust spot on a shotgun of mine with cold bluing, I was wanting to get oxpho blue as it's supposed to be the best on rust but no one seems to stock it and the retailers sold me some superblue instead.
Anyway I used brake cleaner to remove the oil and went over the rust with a wire brush first then cleaned again and applied the bluing solution.
Something I noticed was that it didn't really make the steel very dark at all like I saw in the videos.
I was told you need to rinse with water straight after to complete the chemical reaction, so did all that.
But the finish was rather poor looking. Instructions said to repeat the process until you get the desired results, but each coat seems to undo what I had already applied.
I lost count how many times I went over but in the end I got it good enough I thought, but it still was noticeably lighter.
What's more annoying is it damages the good bluing around the affected area.
Applying gun oil makes it blend in better but even with all the oil on it and the thing rusted really bad after a week and pulling it out of the safe!

Any ideas whats gone wrong?