K-9: Yes, I use BoeShield T-9 quite a bit - but on my boat and its electronics, not on my firearms. The T-9 stuff is incredible, but it's made from a modified parrafin wax type of prerservative. I prefer not to have wax in/on a fiearm as it can build up and as with any wax, it can get sticky and attract dirt.
T-9 has its applications, but I don't use it on firearms.
How about the good old standby RIG gun grease for long-term storage??