The I Knead Sour-Dough OPI Nail Polish, F60, is part of the OPI San Francisco Collection.

The I Knead Sour-Dough OPI Nail Polish is part of the OPI San Francisco Collection. Our I Knead Sour-Dough OPI Nail Polish is used at professional nail salons all over the United States. OPI Nail Polish is a professional quality nail polish and is very strong and durable. OPI Nail Polish works wonders on either natural fingernails or acrylic nails.