Firm up flimsy nails, naturally. Whether used as basecoat or over polish, Ferme Nail Hardener facilitates the formation of keratin, the protein that promotes the growth of healthy hair and nails. To keep nails from becoming brittle, Ferme Nail Hardener is formulated without formaldehyde, toluene, DBP, and camphor. As a basecoat, apply only one coat of Ferme Nail Hardener on clean, dry nails. As a top coat, apply a thin coat over dry lacquer. For best result, use as a basecoat so that the treatment may penetrate the nails more easily. Apply one coat every 3-5 days. Results will be seen after 2-3 weeks of continuous usage.