In 1978, when I was medically retired from the Navy, we used a lot of WD-40. When I returned to the Navy in 1980, I found WD-40 had been outlawed in Naval Aviation, and we were starting to use Break-Free. IMHO, Break-Free is a far superior product. We used it on our hand guns, bomb racks, missile launchers, M61 guns, etc. where we usually had lots of corrosion problems at sea, and all our corrosion problems went away. It does not gum up like WD-40. I have seen it lift corrosion off an item, and then lay down a protective teflon coating. You can use it on door locks and padlocks and not worry about it gumming up and or freezing in the winter time like WD-40 will do. Squeaking hinges won't squeak and more. You can generally find it in the sporting goods section of your store around gun cleaning equipment. Lowes also carries it.