I used PMC-780 (http://smooth-on.com/), @hummieee used the stuff from bjb https://bjbenterprises.com/index.php/polyurethanes/castable/flexible/all-purpose/tc-680-a-b/ which he states is superior (and he did way more research) I was happy with my results though
btw, don’t forget to read the original thread on builders https://www.electric-skateboard.builders/t/diy-wheel-casting/6546
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