Salon perfect finish up to 10 days. Guaranteed. Chip-resistant protection, No DBP, toluene, formaldehyde. Salon tested Patented Hardening Complex, with Biotin & Spirulina, creates a network to reinforce weak nails so they are more resistant to breaking. What It Is A salon strength protective top coat that improves color wear. How It Works: Salon tested formula with patented hardening complex, Biotin & Spirulina, creates a network that supports & strengthens weak nails.