I've got a four cavity, bondo mold and a 3 cavity silicone mold that I made. I throw a bunch of swim senkos and the ones I've made have caught some good fish. I mixed 502 and 536 about 50/50 and added a little hardener to get it close to the hardness. The salt, I put in a coffee grinder to make it powder and it came out good.
SE Kansas grass grower