Casting with silicone? Ears for a binaural microphone project...


New Member
Hi there guys,

I've been using this site for a reference now as I plan this project. Apologies in advance for the wall of text!

I started with an alginate mould of a friend's ears, created a plaster cast from that, and then a silicone mould from that. This all worked perfectly.

I had read on a couple of forums and elsewhere that silicone casting from a silicone mould is fine with a vaseline release agent. I guess these people know something I don't, as I coated the mould and cast it with silicone and all I ended up with is two rather useless, very expensive blocks of blue rubber. They have bonded together entirely.

I'm at a bit of a loss now and, being a poor student, my budget is limited.

I have about 300 grams of alginate, 450 grams of Tinsil 7025, and a bag of plaster of paris left over. I also have my plaster casts.

I wonder what you guys would suggest I do?

My ideas are:
1) Create alginate moulds from the plaster cast, then a silicone cast from that
2) Invest in a different, flexible moulding agent I can then cast into with the Tinsil

I would really like to end up with a reusable mould so I can make further casts, which rules out the first idea, but the priority really is finishing up the project at this point.

I thank you in advance for your wise words!

P.S. I've been blogging my progress right up until the point it all went to hell here:

P.P.S. I've posted this same question over at theeffectslab, I'm sorry if it's bad etiquette to post the exact same text in two places. Just trying to reach as many learned experts as possible!
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