I have the ingredients in store, but haven't produced the end product yet, as there's no shortage here for the time being. At the age of about 13, we were three friends that built rockets and produced the BP ourselves and formed the propellant core with shellack. The rockets were all metal and we turned the nozzels according to measures we found in books (no net at that time). We lived next door to a military experimental aircraft field. The rockets worked just fine. They all disappeared. We were lucky not to shoot down any jet fighters.