Zamak temp might be pushing it...but works for pewter and some variants...
If you use zamak you can skip the wax and pour potmetal directly into a urethane mold...
I've used R and R Ultra and Astrovest and Kerr satin cast ... the stuff I make is just as good...same with the ceramic shell slurry I make...used...
make your own investment..it's cheaper...haha
also...no degassing required...
https://www.reynoldsam.com/product/econ-60/?pk_campaign=ramdyn&pk_kwd= got molds made of this that are 10 years old ..still producing nice...
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