It was sent to me in Belgium without problems whatsoever, it is only a small quantity of grease in a small plastic container.
“At the risk of muddying the waters, I also wonder, if the “AP Special Mount Grease” formulation is even permitted to be shipped overseas in air-cargo, given that it is potentially a fire hazard, possibly explosive canister in the high altitude unpressurized airplane cargo hold. “
I agree that there might be shipping restrictions, and the rest of your points, but I am curious. Which airplanes do you think have an unpressurized cargo hold?