Anyone ever use Ballistol to coat/penetrate.lube/oil their guns to protect against rust?

I usually just store mine with a light coating of oil in the bore and chambers, and then I keep the outside of the gun clean and dry...wiped with a soft, clean, and dry towel.

I did notice on a blued gun the other day that there was a brown tint to the towel when I lightly used some Flitz on it. That worried me a bit.