It seems as if anything matte is becoming popular (ex: matte lipstick) and nail polish is no exception! China Glaze is one of the brands that now has a Flat Finish top coat. Their top coat is called Matte magic.
Details: This little bottle of milky clear (contradictory, I know) colored nail polish is a top coat that magically turns any nail polish that you apply into a matte color.
Where to Buy: I purchased mine at Sally's Beauty Supply. I originally purchased this for $5.99, but recently saw it on sale there for $2.99! This bottle is slightly smaller than regular China Glaze nail polishes. This top coat is .325 oz. I am sure you could also purchase this anywhere that China Glaze nail polishes are sold.
How to use it: You apply your colored nail polish as you usually would. Then, you let the nail color dry for the normal amount of time. Instead of using your regular top coat, you apply this to your nails
How it works: As the topcoat dries you will watch your nail color turn into a matte color. As you can see in the picture, the left nail has a regular top coat, and the right nail has the China Glaze Matte Magic. (Excuse the messy polish job)
My thoughts: I think this is a must for any nail polish lover. By owning this topcoat, you instantly double your nail polish collection!
Overall rating: A+
Note: I have not tried any other matte top coats, so I can't compare this to others.