Transparent nail hardener for noticeably stronger fingernails with a high-gloss finish For hardened, stronger nails Transparent nail polish with a high-gloss finish Suitable for use as a base coat THE EXTREME NAIL HARDENER can be used as a base coat or as a clear nail polish and has a high-gloss finish. The formula ensures noticeably stronger, harder* nails – the polish can be applied twice a week as a cure for soft fingernails that are prone to chipping.