Brent....that is the "old gunshow trick", Never "re-finished"...

You certainly can do that. Rust blue is a chemical process that can be stopped and started at will. It actually works quite well in certain situations, especially for small areas of repair. I do that regularly after re-attaching fore end lugs that have come loose.

In some ways it is not that different than blending an area of stock repair in to an existing finish.

Steve