Ive seen on some mold sellers that they pour tails, let them harden, then pour the worm a different color and I want to be sure I got this right. I have a Charlie Brewer type of worm mold (two piece). I want to pour the worms about half way, let them harden, open the mold and cut them off with a exacto knife, fit the tais back in the mold, close it up and top the rest of the mold off with adifferent color. Have I got this right? So I can make black wormw with pink tails?