One common polymer clay challenge is finding paints and varnishes that don't become sticky on polymer clay. It's important to always test paints and varnishes before applying to a polymer clay project.
How to Firm Up Soft Polymer Clay
Here's how to fix sticky polymer clay sealers and save your project
Sticky Paint or Varnish on Polymer Clay (Always test first!) - The Blue Bottle Tree
Polymer Clay Art 281592533574 29, PDF, Polyvinyl Chloride
Gloss Polyurethane Varnish for Art, Craft, DIY, Clay, Sculpey and
20 polymer clay tips and tricks for beginners – Mont Marte Global
Understanding Polymer Clay Glazes, Sealers, and Varnishes
A Beginner's Guide to Polymer Clay Art, by Leah Angelos
How to Seal Polymer Clay With Varnish - Questions and Answers
The Blue Bottle Tree