Suggestions on How to Mold without Losing his Fingers?

Hi, what do you want the final cast to be made of? A lot of maquette makers will cast using a hard plastic material and they will remove the arms, tails ect….and cast them separately. And then   attach them after casting and use a bit of putty model makers use to hide the seam. Another helpful thing after you remove the arms is to add a metal or wood dowel and on the other cut off area add a hole that the dowel will plug into after casting. There is a handy video that shows all of this on Stan Winston’s videos that show how to cast a maquette ( the video is casting a cool friendly yetti character) I hope this helps you.

Hi Monika, the video may have a material list. For casting a urethane resin is pretty standard urethane is short for polyurethane…is a two part mix that becomes a hard plastic fairly quickly ( the cure time varies for different products sometimes doing a super small test with a super small amount will give you a idea for how quickly you need to pour the material into a mold.) Smooth on is a good brand …they have a product Smooth Cast 300 that would do the job, it will be a solid white when fully cured that can be painted. It can be confusing when looking through product lists, there are many types of urethane plastics within one companies brand…the differences, are that the resins come in a variety of flexible to very hard,  they have resins that are more durable vs brittle and resins clear vs a solid color. smooth on website will have a phone number that they can help you also. The big tip for using the two part resin is to make sure your mold is free of any water. Any water will cause the resin to foam and ruin your sculpture. I hope this helps!

Hi Monika, what type of clay did you make your sculpture with ? It looks like sculpy ? If it is you can bake your sculpture in the oven. If its eyes are plastic you will need to take them out before baking. 
Good luck with your project. 
Regards, Sean 

Monika, you don't need to make a mold of a super sculpey sculpture. After you bake in oven its done and ready to paint. The Stan Winston School has a course "Creature Design - Digital To Practical" by Casey Love that shows how to sculpt using super sculpey. 
Welcome to the Stan Winston School. 
Regards, Sean Dalton 

Monika Salter said:

 Does anyone have a tip or trick on making sure your sculpts don't crack after baking?

TJ- I purchased the two-part urethane you suggested for mold making and plan to try it out with a set of hands I want to mold for stop motion puppets. Since I need lots of hands, I thought it would be a better test than the ghoul sculpt.
Wish me luck!! 

I am not super experienced with the polymer clays so was curious too about this.
this looks like handy info for how to prevent cracks.
https://www.sculpey.com/blogs/blog/avoid-cracks-when-baking-polymer-clay#:~:text=Fully%20Condition%20Your%20Clay,placing%20it%20in%20the%20oven.

For the mold making… strong work diving into it. Are you going to use silicone to make the mold that the urethane will be cast in?  Like in the Aaron Globerman video. I liked that video too. And look to make a maquette soon and cast it like he did. Very cool you are making a stop motion puppet!