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LimitlessEndeavours's avatar

How to make a two-part mold

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You can't make your own mold/cast or don't want to waste money and material? I offer you my help! I can make molds and casts from YOUR object for the fraction of the price you would spend on materials! Send me a note!

Have you seen my other tutorials?

Learn From Mistakes Others Make by LimitlessEndeavours How to make a resin cast in a one-part mold by LimitlessEndeavours How to make a one-part mold by LimitlessEndeavours

Blank resin canine jaw sets can be purchased! More infos? See here!
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LocianDarlenKnight's avatar
Hello i'm totaly new to casting so this tutorial helps a lot! ; w;
i really like to try it my self but i want to be sure about some things.
instead of clay would home made silicon putty work? And do you maybe know how to cast a ball jointed doll?
Thanks in advance! Llama Emoji-02 (Blush) [V1] 
LimitlessEndeavours's avatar
I don't have any experience with home made silicone, so I unfortunately can't give you an answer to that question. In regards of the BJD casting, there are plenty of how-to's on google. I did a BJD casting once but I was inexperienced and probably chose a harder way as to how it is actually made. :I

I'm sorry, that I am no help with your questions. Good luck with your project, I hope you figure it out. :)
LocianDarlenKnight's avatar
Its oke and thank you anyway! ; w;
RainMaKer02's avatar

Thank you very much for the tutorial, it is very useful !! Have you copied clay that has already hardened? Or is it still baked clay
LimitlessEndeavours's avatar
You can use both clays that have been baked or don't harden at all.
RainMaKer02's avatar
Thanks for answering I ask you why I try to make a two-sided mold to a piece of clay without drying. The piece was contained in epoxy clay, despite the fact that it put mold release, the piece would stick and when it was deformed so that the second face did not fit
LimitlessEndeavours's avatar
I don't understand what you're saying. You used epoxy as a mold?

You can't do a two part silicone mold with a clay or any other object that is soft. You can use an unbaked object when doing a one part mold only.
RainMaKer02's avatar

Thank you, that last one I needed to know. Sorry for the inconvenience ! Thaaaaaaaaaaaaaaaaaaaaaaaaaaaaaanks !!!!!!!!!!!
Ayedeas's avatar
So you don't need a vacuum chamber? I think I'll have to try this on some smaller sculptures, thank you! 

What type of clay would you recommend to press the sculpture into, to pour the silicone over? Regular pottery clay, or? I've always wondered that. 

Thank you for this tutorial!
LimitlessEndeavours's avatar
Not for this type of silicone I used. There are silicones that have to be degassed, so please make sure you purchase the right type for your needs.

I recommend water based clay. Check out this youtube video, it shows really great how to do this molding technique --> www.youtube.com/watch?v=DEVi0m…

You're welcome :meow:
Ayedeas's avatar
That's perfect, thank you! :la:
aurorawilc's avatar
Hello dear! Thank you so much for making so detailed tutorials! I definitely need to try it, even if only for paws or big heads to make them lighter, this looks more durable than any clay!
LimitlessEndeavours's avatar
You're welcome! Resin is by far more durable than clay. I recommend it if you have the option.
aurorawilc's avatar
I sent you note about commission, I m not sure if its lost somewhere :)
LimitlessEndeavours's avatar
I sent you a note back :)
aurorawilc's avatar
Thanks! I sent email :D
Jay5Fox's avatar
I'll be trying it!
LimitlessEndeavours's avatar
Good luck and have fun! :)
PixelMecha's avatar
I've just bought myself some silicone moulding compound and resin to go with it. I'm pretty excited, I'll certainly be trying out some of the techniques you've done such great tutorials for!
LimitlessEndeavours's avatar
Have you done any molding/casting yet? :la: If so, how did it go? Tell me!
PixelMecha's avatar
I haven't yet! I've been taking my sweet time sculpting. Say, have you got any tips for working in the months of the year when it's colder? I'm worried about doing the moulding and casting somewhere too enclosed, but it's too cold/wet outside to do it there. I could potentially do it in the garage but it's cold out there and it might not set correctly.
I don't really have a space in my house that I can easily set this all up and leave it and that is warm and well ventilated. Any ideas? What sort of space do you do your moulding/casting in?
LimitlessEndeavours's avatar
Molding and casting in colder weather can be a little tricky. The mold sets in the cold (as far as my materials go, around 70° Fahrenheit), it just takes longer. Casting in a cold winterish area is not to recommend. It will take the resin a lot longer to flash and set. Sometimes I had uncured patches that ruined my cast.

I, with the materials I have, can mold inside the house. I have a normal room to work in. Though I have no door. Weird.
You can move the molds after about an hour and put them aside somewhere else to let them cure all the way. They don't have to stand around in your way.

I can cast inside too, though my resin "smells" (it is more like a weird burning sensation in your windpipe when you hang yourself right over the mixing cups and molds). I'd suggest leaving a window partially open for air circulation, the door closed (if you have one) and after casting just opening the window all the way for 5 minutes to let fresh air in. You can/should wear a respirator mask for protection.

BUT: I can only talk about products from smooth-on. Best is to check the instructions of the products you have. They should give you information about working temperatures and general safety. I'm not sure if any of this helps you Sweating a little... 

I'm so curious what you plan on casting :eager:
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