- I am making my first attempts at pewter casting into RTV. The RTV and
pewter both came from Micromark. I'm using a Lee melter, the pro-20 I
think. My problem is that I can get a good resin cast in the mold but
pewter leaves voids. I'm trying to mold a spoked wheel for a train. I've
posted pictures of the original part, resin part, RTV mold, and an open
pour attempt. (They are in the files area.) I have tried open and closed
pours with the same results.
Do I need more vent holes? The spokes are less than 1/8th inch thick. I'm
not sure if the metal is too hot since I don't have any way to check its
temperature. I have noticed an orange cast on the metal after it cools
Any help would be appreciated.