Don't use Boesheild T-9 on anything that will be exposed to dirt. I see to use it to lube my traveler (before McLube came along), based on rave reviews by my dealer and a fellow sailor. All it did was trap sand/dirt/road grime, which the traveler ground into a fine paste, and made the traveler stickier than if I'd done nothing...

WD-40 is similar, in my experience. I ruined an electric train engine when I was a kid by spraying that on the wheels and motor.

Mike