It's so easy a caveman could do it. :rotf: :rotf: :rotf: Sorry I couldn't help myself.
It's as easy as wiping the LMF on the barrel/part, letting rust, then carding off. Only exasperating part is waiting between coats. After you get the color you want, you neutralize with ammonia, or a baking soda solution. then wax or oil the barrel. It says you don't have to degrease, but I would recommend it. Only problem you might run into is lack of humidity this time of year, but that is easily overcome with a steamy bathroom, or sweatbox. First couple of coats may look bad/blotchey but by the third or forth, things start looking good.
Bill
I started with nothing, and still have most of it left!