Ed Huntress wrote:

I have read that they smoked new molds to keep them from sticking. You can
do that very quickly with an acetylene torch, with the oxygen turned off.

--
Ed Huntress

For lead casting, bullets and model soldiers, we used to use a candle to
put a smoke carbon release layer on the mold surface, it worked well.
For "Spencer's" situation a candle should work too since he mentions
the part will only be the size of a hocky puck. Also a note on molds,
besides steel and cast Iron, brass or copper should work too.