Hatchet-Jack, Thanks for the reply. I have now emailed Jim asking this question. The reason I ask, is because I had a barrel do some rusting after using his earlier product. I’ve used it on three guns and this is the only one that rusted. Of the three, I think one was a Getz and the other two were Rice, it was one of the Rice that rusted and to be on honest, I don’t remember how I treated that barrel. I have used finish, wax and oil on different barrels and never had issues. I did clean it up, retreated it, oiled and so far no rust.