I left the cap a bit loose when putting it away in my Helmer. When I pulled the bottle out, this is what greeted me. If you think dried out glitter can't be saved, think again!
Ball of glitter, meet Seche Restore. Seche Restore is just one of the many nail polish thinners out there. Just be sure to use a thinner that does not contain acetone.
Then I used an orange stick to loosen up the glitter. It takes a few minutes of stirring and scraping off the sides to start the revival process. When the glitter is loose enough, I put the cap back on and then shook for a few minutes.
Pop Beauty Twinkle. Three coats. Good as new!