We recently found something interesting at Brownells gunsmithing supply — they tested how well a number of substances prevented rust. The results surprised us: Plain old WD-40 was the most successful in keeping rust from forming on a mild steel surface, outperforming many other substances engineered specifically the job.
So what do you think, Hot or Not? Let us know in comments.
Knowing the Limits of Rust Preventatives [Brownells]