Does anyone know how this works? Is there an actual substance (foil) that is used?

I don't mean to get into a discussion about whether "touching up" a bat affects value, etc...just wondering about the process and materials if anyone knows.

Here is a great example of this type of restoration on John Taube's website for anyone who doesn't know what I am referring to. As with most things bat related, John seems to do an incredible job.

http://www.gameusedbats.com/images/b...on_foil_lg.jpg