If you're going to make different color body parts, (claws, tails, etc.) you'll need to use a mold for that particular part or shoot the mold in the part color of choice. Then remove, cut off whatever piece you want to use and reinsert it in the mold. It is best to do this shortly after making the piece. Soft plastic will exude oil over time keeping it from making a good bond with the main color. If you cant do it right away, cut the plastic back 1/8" or so before shooting to help it bond. Also, it works best to have your plastic at a pretty high temp (330 to 350) when injecting the main color. The hotter plastic will bond better with the tail. I hope that makes sense!!!