This might be of interest to you for inspiration: [Hudsalve](Försvarets Hudsalva Original Military Balm, 2 pieces/Ointment 9 ml https://www.amazon.com/dp/B06XJ3HXB8/ref=cm_sw_r_cp_api_i_bjKzFb15F8P4H). I’ve never actually bought it but it’s pretty legendary stuff. It was invented by the Swedish military in the 1950s. You can grease a gun with it, use it as lip balm or even eat it/fry with it (due to the beef tarrow in it).

Will be interested to see what your final product looks like. Good luck!