I bought this product being sceptical since all the other peoducts I have used had varying results! Well I have been using this for two weeks, and my nails are actually growing out thicker then usual. I have always had brittle nails that break before they can even grow out half an inch, and they have grown past the point with this product. You use it like any Sally Hansen Quick care product under your nailpolish. Brush is on like a nail polish and let it dry and apply your nail polish like usual. It has hardly any smell unlike most nailpolish. It isn't too much cost wise, and it has great results. If you suffer from brittle nails give this a try cause it is well worth wild. I am very happy to say this product has strenthened my nails in weeks and I will continue to use it!