The following was posted on this thread http://www.crappie.com/gr8vb3/showthread.php?t=61165 by Roberta.

QUOTE "I tired a couple of ways to make my master - cobbled together pieces of existing jig bodies, scupted things out of clay that can be hardened. I probably should have used wood. What I wanted to make were crappie sized versions of some of the bass plastics - tiny newts. bugs, etc. I also made and was fairly happy with some "amoeba" bodies that just sort of jiggle on the end of the hook. Those work pretty well for cold water conditions.

Any way, I made up some plaster of Paris, poured in into a greased shallow plastic dish and placed the oiled (so it doesn't stick) master into the plaster half way and let it set..I was basicially using the same technique, but on a smaller scale, of casting a plaster piece that I used in art school. I tried making two-piece molds so I could have round plastics, but the plastic gets too many bubbles and it never quite matched up. Bubbles are the main problem. If I get an itch to try it again, I'll use a stiffer plaster and take two steps to make my mold.

After it set a while, I pulled out the master and let the whole thing dry thoroughly. Coated with Modge Podge and then poured some hot plastisol in it. Follow directions on the plastisol bottle . "- Roberta
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I am sure there may be other threads on the subject too. Go to Search and type in molds.