Mold Making Techniques – Sculpting Two Part Mold For Silicone Rubber (Pt.3)

Mold Making Techniques – Sculpting Two Part Mold For Silicone Rubber (Pt.3)

Molding and casting skull props with silicone rubber. Mold making techniques and how to make a human skull mold part 3. Sculpting clay for the two halves of the silicone mold How to make a matrix, case, blanket, or also known as a mother mold. In this Third Video I quickly go over some tips when choosing or making a skull that you want to duplicate. A skull having lots of holes for example will need more prep time and is necessary to seal all and every crack and crevasse to prevent the expensive silicone from leaking into the wrong areas. I then make all the changes I needed to and add detail to one of our skulls before building up the top half of the clay mold. There are several places to purchase fake or realistic looking skulls and often times the more realistic and detailed they are the more they cost. This can get expensive if your needing 30 or more skulls for a catacomb scene, film shoot or a Halloween yard or home haunt. A well built skull mold is one way to help keep the over all cost of your project down in the long run. Although some of the materials to get started will have some cost attached to it like silicone rubber, clay, resins, plaster, or fiberglass for instance, it should pay off in the end. So if your a do it yourself type of a person with a little time and patience than this video may help you get some ideas for your future skull mold making project. This video is the third in a series of videos that will take you through all the steps we took to make the style mold we use all the time to make our Halloween skull props. We place these skulls all throughout our home and yard haunt and inside our walk through maze and crypt mausoleums. We created a whole catacomb wall behind our foam crypt coffin prop we had last year. We cast them with hard plaster and drilled holes and glued 3/8″ bolts into the backs to make mounting to the wall easier. There are so many skulls out there on the market. If you choose not to sculpt one you should be able to find one you like and with lots of detail. In this video I quickly go over some of the issues you need to address if choosing to mold a skull that has several holes and removable tops. It is very important to seal all openings to prevent the silicone from leaking inside. I have super glued, used clay, and even used automotive Bondo to get rid of the seam so it would not be reproduced on each one of the castings. The skull I use in these mold making videos needed some improvements that bugged me about the first mold I made. I share how I improved and added some details for my needs to my existing skull I use for my new mold. I add length to the over all skull, beef up the cheek bones and hollow out behind the teeth to make it easier to break and chip away. I will be adding annotations soon.

We used royalty free music for this video from

First let’s go over a couple skull prepping tips
When choosing your skull for this project check for any holes or cracks
Super glue works well for attaching any removable parts
I use clay to fill the holes which will prevent the silicone from leaking inside the skull
Keep in mind that you will be removing castings later so the farther back your cavities go the more difficult it may be to release
Filling all the holes and cracks is one of the most critical parts of this project if you choose a hollow skull to mold
Automotive Bondo also works well for covering up the seams so you won’t see them in your castings later
I remove the skull out from the clay after I have removed it from the case mold
I make any small repairs and add all the fine details at this time
Once finished apply a thin coat of ease release agent over the entire skull
I want to make the skull positioned at the same height it was before so all the spacing stays the same when we made the case
I’m building the material out around the bottom of the skull so that it will make removing the castings easier
These little nylock nuts make nice locking keys for the silicone inside the cheek bones

To continue the skull mold making videos click these links below
Making A Skull Mold: Part 1

Making A Skull Mold: Part 2

Making A Skull Mold: Part 4

Making A Skull Mold: Part 5

How To Make A Fiberglass & Silicone Mold: Human Skull Prop Castings

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