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I like the Renwax for a second reason, that it makes the blades so much easier to rinse clean. It seems to stick around through an awful lot of lather and rinsing, but I don't count on it to protect the spine and edge for as long as I count on it for the rest of the blade. I can't imagine that stropping doesn't rub it away from those two high-contact zones. So I also supplement it with Remoil or Tuf-glide. I probably don't refresh the Renwax more than twice a year on any blade.
I also like to put some Tuf-glide on the pivot pin, to make sure it's protected if I miss wicking or blowing a drop of water out of there.
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I use RenWax and nothing else. But then again I only have two straights and I mainly use just one all week and then shave with the other razor that was professionally honed on the weekends just to get a reference shave to compare to so I can make sure I'm not dulling my other blade with stropping and refreshing on hone while I'm learning. It just stays in it's leather case all week until I use it. I haven't had any problems yet with letting it sit that long. It doesn't get stored in my bathroom where there's humidity though.
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For long term storage I have used " spray silicone lubricant". I have used it for years to protect cast iron equipment used for sausage making. Also I use a metal protectant from "Chestertan" that lasts for 2 years but it is a very waxy consistancy.