Urethane Resin - Liquid Plastic
Molding Compound - Quick-Sil
Disposable Measuring containers
Step 1: Create the Original
Step 2: Quick-Sil Mold
Next, just push it onto the hardened object making sure to fill in all the details. It's a little harder than play dough and pretty malleable. Also, attempt to get the back as level as possible since that will be on the table when you cast.
I like Quick-Sil since it's reasonably priced if you're using it for small objects. The 3oz set should be under $10. Anything larger than this symbol and you'd be better off using a different silicon or latex mold material. Both of those are a whole other animal that I won't get into, but I'm assuming someone else on this site has done a fantastic job covering.
Step 3: Pour in the Plastic
I used Smooth-On Liquid Plastic - Smooth Cast 300. Make sure you have cups with measurements on them and lots of stir sticks. Put on your safety gear and measure out the two parts in equal amounts. With something this small, you won't need much at all, so be precise with your measurements. It's starts to set up after about a minute so you'll need to work quickly to fill the mold. Wait 10 minutes and it should be fully set up. I tried tinting it, but the color never came out right for this project, but for other objects it might work well.
Safety note: Resin is toxic when it's curing, so be sure to open the windows and wear a respirator and gloves.
Step 4: Paint
There you go! Now you can run off into a leap of faith with your new found power of the Assassinos. Or broaches, earrings or whatever lovely items you made from the process.