Easy as pie! Make a divider plate out of any thing I use roof flashing or thin aluminium plate from hobby lobby but in a pinch tin foil works well. Make your cut outs for your mold pins and injector. Put the divider in shoot the mold and now you have two halfs of your bait remove one side for use later and the side in the mold you can use paint or dye I bet a big piece of gliiter like people make cloths out of would look cool and reinject the same or different color and there you have it