Home Forums Hunting & Shooting Gunsmithing Slow Rust Blue Question

I've learned some things doing my first firearm (in addition to the soot being normal).

1) Don't polish over 320 grit sandpaper (maybe 400 grit). The rougher grit makes the bluing take better. The rough inside of the frame blued up with the first application.
2) On the first application, instead of making single straight swipes, go over the metal hard and in circles, repeatedly.
3) Put the rust solution on thinly. The smoother the surface, the harder this will be to do.

One thing I tried, that I think worked, was to put the solution on and then let it dry outside in the sunlight, and then take indoors to hang in a moist hot environment.