Review (1/5): Did not make nails hard-still broke
I used this as a base/top coat to normal nail polish, as well as just a base coat to protect my nails. As a base coat, this did not really do anything. My nails weren't much harder after use and they still would break. For reference, my nails are extremely brittle. As a top coat, it did not dry very shiny and left a bumpy texture on my nails. I would not recommend this product as a protective coat to make nails harder and prevent breaking, nor as a top coat on nail polish.