Years ago, I used marmot oil for patch lube and for waterproofing my books. Excellent stuff for both. It was better than the bear grease I had, which was rendered with too much heat, so was more of a shortening than an oil. It did work, but not as good as marmot oil, "harvested" from hoary marmots atop Hudson's Bay Mountain in Smithers, BC. .458'd they were.