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That's it, graphite powder. Googling it suggests it should also help against locks freezing up, maybe because if the mechanism is filled with lubricant no water can come in so there's nothing to freeze and seize?
@JurekB A lighter is a good back-up plan, cheers! Might as well start smoking then.
Tijmen-
suggests it should also help against locks freezing up, maybe because if the mechanism is filled with lubricant no water can come in
I think it has more to do with not wetting the metal surfaces. If the ice can only stick to a graphite layer attached to the metal, it only take a small shear load to free the mechanism because the graphite itself shears very easily, even more so when there are water molecules adsorbed onto the surface of the graphite.
gbj_tester
Graphite powder is good, although that's as a lubricant, not sure if it stops things freezing