First, let me start by saying I'm no molding or casting expert, I'm just taking what I've gleamed from working with Ken Walker and tinkering to get the end result I'm looking for. There's a myriad of ways to cast mouth parts but this will cover using a silicone mold (Mold All from WESCO) and casting with Fantastic Cast. Here's what you'll need. 1. Mold All ( I buy the 10lb kits so i know i have enough, and enough FAST catalyst to over catalyze the mold all, I'll explain why FAST catalyst in a few lines.) 2. Mixing bowls and stir sticks 3. High speed drill and mixer 4. Clay or high fibre bedding material 5. Bondo 6. Fantastic Cast (or suitable rigid casting plastic) 7. Vacuum chamber (not necessary but I wish I would have had one) Since I can only post 192K of pics per entry this will be broken up a bit so stick with me. pic #1: shows what we're working with (in this case its the lower jaw off a Mule Deer buck I took in for a european mount). The first thing we need to do is get the piece thoroughly cleaned with soap and water to rinse off any blood, dirt or food that may be in there. Some people actually shave the hair from the lip lline at this point so it doesn't come out in the mold, I'm not worried about this since when I clean the mold out the hair comes out with the first casting anyway. pic #2: After washing we're going to set this aside in a freezer to let it stiffen up some so we can shape the lips to the exact position we want. Check on it periodically and adjust the lips as needed.