If it ain't broke, don't fix it.
While I appreciate the benefits of waxing (firearms), if a particular individual has had no issues with a marginal preservative, why push him to change it? Things just don't rust as badly in central CA, unless you are right on the ocean. Humidity today in Bakersfield is about 27%. Humidity today in Dallas is about 71%. I doubt Dallas has the worst humidity in the USA, I just chose them as an example. Generally speaking, corrosion tests tend to subject the item and preservative being tested to something MUCH worse than even 35% humidity (which is a very humid day, where I grew up).
If you don't mind my asking, where is this museum? I might very well be able to/like to visit sometime.