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Before I begin, I would like to say that I do not endorse recasting and will not be talking about recasting miniatures created and legally protected by businesses.

I saw some tuts online of making two part moulds (RTV silicone) for resin casting and am about to start hopefully before Christmas.
There is a clay involved that allows the mould to be made in separate halves and I've heard the advice not to use any with sulphur as that would mess up the silicone's curing process.
A lot of people have been using plasticine from what I've seen, but it seems like there are multiple brands of plasticine rather than the one I thought was used for kids.

I want to be a cheap ass however and I am intent on knowing if regular, kiddy plasticine has sulphur or not.

EDIT: These types:

The formulation of Plasticine apparently is secret, so without a spectrographic analyser we can't find out if there is sulphur in it.

Your best approach would be to contact someone who is doing moulds with clay and ask them what they use.

I have no idea about that stuff, but here is a good affordable alternative;

http://www.shop.brickintheyard.com/Protolina-Natural-Plastalina-Modeling-Clay-1lb-ProtolinaU1.htm

I buy stuff from these guys all the time - they know their stuff and have good products.

best of luck!

Personally I use thermoplastic matterial from ebay which is quite good for small parts, quick and easy mould making.

RTV sillicone is far better (and more expencive) and is perfect for making 2-part moulds.

Have you checked FIMO??

I use modelling clay i buy at the local Hobby Lobby and just give my parts a quick brush of mold release before putting them into the clay. Works great so far, and i have never checked to see if its nonsulphur. I also suggest getting it in a bright or dark color to contrast against your original. This helps in seeing clearly whereyou will be making mold lines in your stuff.

JackDarkmoore wrote:
Personally I use thermoplastic matterial from ebay which is quite good for small parts, quick and easy mould making.

RTV sillicone is far better (and more expencive) and is perfect for making 2-part moulds.

Have you checked FIMO??

Yep, I'm planning to use RTV silicone. What I want to use the clay for however is not for the actual moulds, but as a filler material to make the moulds one part at a time.

I just bought some random big block of clay to use with my casting. It works ok but it is a little bit to soft for my taste. In hindsight I wish I had bought the dark gray plasticine. In fact I probably will next time I am near a craft store. You will be using it over and over again so do yourself a favor and get the good stuff. There are so many variables involved with getting a perfect cast. Don't hinder yourself with cheap materials.


Automatically Appended Next Post:
If you haven't already check out this guys blog. Good information here.

http://www.dakkadakka.com/dakkaforum/posts/list/540118.page

And here is a tut I found handy as well

http://www.dakkadakka.com/dakkaforum/posts/list/540862.page

I got some Newplast Plasticine and it works fine with RTV silicone.

You could always email the company that makes the plasticine you want to use and ask them if it is sulphur free.