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The molds were made out of bondo. The bondo works ok but the molds aren't going to hold up that long. Its ok as far as experimenting goes but you won't get the clean pours you would is you were using an aluminum one. They come out pretty rough and there's a lot of clean up to get the final result.
I had a post about polishing tins a while ago and I think a product called wenol was recommended but I haven't used it yet. I ended up buying a little buffing kit for the drill press and thats how they end up when you are done.
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