I have used powdered graphite up here in Canada when the winter temps get extreme. It is good for house locks, vehicle door locks, fire arm actions etc. It comes in a small tube and is relatively cheap. Go easy when shooting out a burst, the material is light and a ton flies out. Wipe off the surrounding area after or you will get it all over everything. It works, it's good stuff. I believe that the stuff was made for sticky house locks so maybe pursue it through that direction.