From the packaging:
"Rock Hard bonds together a cross-link of fiber proteins that produces stronger, harder, thicker nails. Rock Hard creates a moisture shield that protects dry nails from unmecessary breaking and splitting. The results are longer, stronger, more flexible nails. Can be used alone, as a hardener, or as a base coat."
I've only just begun using this product, and i already love it. Used as a base coat it provided a smooth gripping surface to which my nail color applied flawlessly, no dragging or streaking. While wearing it my nails already feel harder than with my normal manicure, and i'm hoping over time using it as a base will provide my nails with even more strength and flexibility. Rock Hard is also Toluene and Formaldehyde free.
I'd certainly recommend giving this product a try if you're looking for a treatment base. With the onset of cooler months i have already begun to see some peeling beginning on my nails, so i felt i needed to try a product that might help protect and strengthen them in the coming months.
Rock Hard is available in the US at Sally Beauty Supply. It can also be paired with its partner top coat for even better results!