I really had high hopes for this product after reading many positive reviews. I change my polish A LOT. As a result, my nails, especially on my right hand, are very flaky and brittle. I purchased this off of ebay. Firstly, The scent. It's weird, maybe really strong to some, but I usually do my nails in a well ventilated area. It's a pungent chemical smell. As far as the efficiency of the product, It did 'bond' the flaking tips into my nail. But I haven't seen much improvement in strength. Note: I've been using this for a couple months. Furthermore, I use this as a basecoat, and it does NOT protect against staining at all. I'll finish the bottle out but I wont be repurchasing.