carve a model out of wood or clay.. The easiest shapes are ones you can pour from the top, or in other words, if you have a flat back, you only need a one piece mold to pour into, as opposed to a 2 piece mold, which can get tricky...After you make your model, make a quick silicone mold of it, then make several hard jewerly casting quality wax pieces from that mold. I say wax because ou can use a torch on the wax to clean it up so its super smooth and will allow for some really clean pourings. However many you make will dictate how many baits you want to be cast from your final mold. From there, you make your final mold out of RTV rubber.
depending on how thin your mold is, you might need to make a mother mold of plaster or something to help the rubber keep its shape.
smoothon.com is a great place to get all that stuff. AS for the actual rubber you use to make your baits.. i cant help you there, i have only made molds to cast glass.
I was thinking of giving this a whirl this winter, but i dont think i will have the time
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