Opis start to finish formaldehyde free is a 3 in 1 formula that delivers the benefits of a top coat base coat and nail strengthener infused with wheat protein and calcium the high performance treatment can be applied before nail polish to prevent staining of natural nails after nail varnish for mirror like shine and protection against chipping or as a strengthener to promote harder stronger nails combining all three tasks in one convenient bottle you can expect salon worthy results wit