I've been using this for 7 or 8 years and I'm in agreement with Lee -beats anything I've ever seen or used with respect to rust prevention. I keep all my Smiths in their blue plastic foam-lined cases(almost a crime according to some), and not a one of them have a speck of rust on them after all this time.

It's also an outstanding lubricant, which is of course what oldman45 asked about. It doesn't run off, but also migrates to those areas one can't reach with a rag or whatever one uses to oil the gun, similar to PB Blaster the famous penetrant. I'm sold.

Andy