GREATEST. TOP. COAT. EVER.
Seriously, you will NOT be disappointed with this! Yes, it's $18, but it's a very worthwhile $18. It makes my nails super shiny, my polish lasts for about 2 weeks, it doesn't chip, and it dried REALLY fast!
I just can't stress the importance of this top coat enough. It's like the "jesus" of saviors. True story.
The only downside is that you can only buy it online, but it's worth it.