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Yes, both of those will work, but once you go silicone, you never go back. Most of mine are made from mold urethane, and they are pretty good, but not quite as nice as the silicone.
You can use regular household Silicone, too. Just spread it on in thin layers, and keep adding layers as they dry. Very slow process, but the mold will be excellent if you are patient.
TH
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