Human liquid waste has been used for ages for practical "good purposes". I have "odorized" 2 stroke engines to cool them off, frozen tools, a lock or two. It works and is normally readily available.
Hey Rick... when you get it done it is all your's. My 1st MZ (mine, not dad's) was a kit I purchased in Frankfurt at that huge PX. When I shed the "pickle suit" go out my Buck 101 and started whittling. Browned the barrel and iron. Black walnut stain. No work of art but corn crunchers never knew the difference.