Winner

Essie 3-Way Glaze, $8
Testers loved the simplicity of an effective base coat, top coat, and strengthener in just one bottle. This formula adheres well to polish, provides a high-gloss finish, and prevents all your hard work from chipping away.
To Buy: www.essie.com for locations.

Runner-Up

Sally Hansen Complete Care 4-in-1 Treatment, $13
Another all-in-one formula that produces a super-shiny finish and smooths ridges.
To Buy: At drugstores.