VPI paper (vapor phase inhibiting, IIRC) as sold by Brownell's, is very good stuff. I have only used it for protecting the bores of m/l rifle barrels, but it has worked perfectly for me for going on 30 years. I have several .40 to .50 caliber m/l barrels, in the white, in my shop. I recently found one that I thought I had sold 15 years ago. It is a custom rifled round ball match barrel with a false muzzle. I was shocked when I "uncovered" it, and immediately checked it's condition. When I pulled out the rolled up VPI paper and looked through the unbreeched bore it was perfect. That barrel was untouched, in a terribly humid environment with no HVAC, for all those years and had absolutely no rust. It had been simply wiped down, inside and out, with RIG, then had a fresh piece of VPI paper rolled up and inserted the full length of the bore.
SRH
