I made my own worm mold out of resin.I tryed using it as a one part mold but poured to much or not enough plastic.So I made a two part mold.When I pour the plastic in it will not make it to the tail of the worm.(The tail curls up)I drilled a hole at the tip of the tail hoping to let some air out,did not help.I'm melting down old worms and chunks in microwave.Will the liquid plastic work better for this?