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?"
Using Alcohol Inks with Polymer Clay - The Blue Bottle Tree
Polymer Clay Information and Tutorials - The Blue Bottle Tree
Polymer Clay Sealers, Glazes, and Varnishes - The Blue Bottle Tree
The Right Way to Use Polymer Clay - The Blue Bottle Tree
Polymer Clay Terms - Glossary and Definitions - The Blue Bottle
Review of Cernit Polymer Clay - The Blue Bottle Tree
Testing: Coloring Translucent Premo - The Blue Bottle Tree
What is a Polymer Clay Cane? - The Blue Bottle Tree
Polymer Clay - Should it Still Be Flexible After Baking?
Tutorial of the Month: Beadmaker's Bundle from The Blue Bottle
Fix sticky polymer clay sealers by doing this trick