This will be a different mold compared to the hands and feet. I will be making a 1 part mold / dump mold for his head. This is when silicone is poured in to a box sculpt and incases the sculpt in silicone.
The sculpt can then be removed by cutting in to the silicone.
To start I attached a pour spout to the head (Head is baked at this point)
This is to give my self something to pour the fast cast in to later to cast up the head, and also it keeps the head secure and up right!
The pour spout here is just a piece of sculpey, baked and then hot glued to the back of the head and also hot glued to the base.
Once I knew the head was secure, I boxed the head in with foam board.
The silicone I used for this was the silicone provided by my University. I had recently bought silicone for myself to do the hands and feet as you'll see at a later post, but as I knew a lot of silicone was going to be needed to make this mold, I thought I'll save money and use uni's!
(Did not expect to use as much silicone as I did though)
I measured out some silicone as well as catalyst and started mixing.
Before pouring the silicone straight in to the box I painted a layer in to the eye to ensure silicone gets in to the detail.
I then poured the silicone in. The technique I used was to pour the silicone from a height in to a corner of the box. The reason why I pour from a height is that, as the silicone hits the bottom any air bubbles trapped in the silicone will hopefully pop on impact.
....
I had to mix another batch of silicone up as the first bit only covered half the sculpt!
Needless to say I don't think the uni or the class was happy that I used so much silicone!
I left the silicone to cure over night. And came back to it the next day. You should wait around 16 - 24 hours for silicone to fully cure.
This was a big block of silicone!!!!
After it was removed from the foam board I took a scalpel and cleaned up all of the excess around the mold to tidy it up.
Because who wants a messy mold, right!
After it was removed from the foam board I took a scalpel and cleaned up all of the excess around the mold to tidy it up.
Because who wants a messy mold, right!
The way I cut the sculpt out was by taking a scalpel and cutting into the silicone.
I cut a zig zag pattern half to 3/4 of the way to the sculpt and then as I get nearer to the sculpt I cut a straight line down.
Zig Zag: The zig zag pattern is used for when you close the mold back up. The pattern acts as registration keys, ensuring the mold doesn't shift.
Straight line: The straight line is used when cutting next to the sculpt as this will be the seam line when you cast. The cleaner the seam line the easier it is to clean it afterwards.
A big help for me when doing this was tested's youtube channel as they show how to do a 1 part mold.
Link here:
https://www.youtube.com/watch?v=J1jDaZX6PCk
I cut a zig zag pattern half to 3/4 of the way to the sculpt and then as I get nearer to the sculpt I cut a straight line down.
Zig Zag: The zig zag pattern is used for when you close the mold back up. The pattern acts as registration keys, ensuring the mold doesn't shift.
Straight line: The straight line is used when cutting next to the sculpt as this will be the seam line when you cast. The cleaner the seam line the easier it is to clean it afterwards.
A big help for me when doing this was tested's youtube channel as they show how to do a 1 part mold.
Link here:
https://www.youtube.com/watch?v=J1jDaZX6PCk
Due to the size, thickness and strength of the silicone, this was a complex task to cut in to!!!
After a while of fighting with the silicone..... The sculpt was Out!!!!!!!
Neck
As I've only got a couple of photos for making the neck and that it was a simple process I thought I'd just add it to this post :)
I started with the sculpt (fairly simple shape)
I then did the same process as the head.
I boxed the sculpt in, poured plaster this time, and waited for it to cure to get a 1 part mold.
As I've only got a couple of photos for making the neck and that it was a simple process I thought I'd just add it to this post :)
I started with the sculpt (fairly simple shape)
I then did the same process as the head.
I boxed the sculpt in, poured plaster this time, and waited for it to cure to get a 1 part mold.
No pour spout was need here and no process of cutting the mold open was needed.
Due to the sculot being it's widest point at the bottom and continuously getting thiner the higher it when that meant the sculpt could pull straight out of the mold.
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