There's a decent article on Cool Mini or Not about making GS molds... it's for making two-part molds, but the basic principles apply to one-part press molds. I made press-molds for FW Purity seals to pretty good success. I took a blob of GS, and pressed it onto the still on the sprue resin seal with the mold flash backing intact. I removed the part once cured, and can press small blobs of GS into the indentations, and remove good fidelity copies of the seals once cured... it's a simple matter of removing the molded part from the rest of the blob pressed into the mold.
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