This item is a little pricey but well worth it.  I purchased it about 12 months ago, and after using it once a week every week, there is at least half a bottle of product left.  I use with China Glaze, OPI, Orly and Butter London polishes. Every manicure is a success, long lasting and smooth coverage.  Wait about 10 minutes between applications of base coat (Butter London), 2 applications of nail polish, then top coat.  Wonderful results!