The only time I've seen molds made from aluminum they were for fishing tackle. My dad used to make and sell alot of custom jig, spinnerbait, and buzzbait molds. His were aluminum, and sometimes brass.
In some cases he would machine the mold out of a billet, other cases he would make a pattern from bondo, or fiberglass resin, and then use the pattern to sandcast the actual mold from aluminum.
If I misunderstood, and you want to make molds to cast aluminum then the place to start is with reading everything you can dig up about sandcasting.
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