^ I used it on the old mechanisms to penetrate and free them up, followed up with the gel lube(which by itself made no difference to the old, corroded shit). On the new one that I just put on, I only applied gel lube.
Lots of people though, at least many that I know, will just keep spraying WD 40 on things like their door hinges over and over again - better than nothing but you're right.