Way back in the 60's and 70's Herters had a rustproofing product for guns called "Proteger". It was a liquid in a small brown glass bottle, and was simply wiped onto the barrel and metal parts of a gun, and protected against rust for prolonged periods of time. I liked it because, among other qualities, it seemed to "set up" and get semi-hard as it dried, unlike other "rust-proofers" on the market. Therefore, it was somewhat harder to rub off with normal use, consequently an application lasted quite a long time...IE: it had great "staying" qualities. Well...it didn't stay forever...you can't buy it anymore.

Q: Is there somewhere I get some of the original product?

Q: Anyone know what the additive is that made it "harden up" as it dried? (wondering if I can add something to make currently available rust-proofers do the same)

Q: Or...is there some currently available off-the-shelf rust proofer that does essentially the same thing?