There are lots of questions about using polymer clay glaze, varnish, or sealer. But first you need to ask "Do you have to seal polymer clay?"
Cosclay - ORIGINAL C3 Sealer 2oz — Cosclay
Polymer Clay Vessel Project - The Blue Bottle Tree
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Best Paint For Polymer Clay: Make Your Sculptures SIZZLE!, 49% OFF
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Polymer Clay Sealers, Glazes, and Varnishes - The Blue Bottle Tree
The Blue Bottle Tree - This isn't resin. This is sanded and buffed