The worst thing that have ever happened to my nails is this IDB Prep. When I tell worst I really mean that. I sprayed it on my nails, applied base, nail polish, top coat. It dried and I wore it for about three days. After that my nails start to peel badly. Nail polish tried to leave me with the upper layer of my nails. When I removed it at the end of third day I saw that my nails a ruined. It's a Holiday season and I can't put nail polish on, because now I've got badly stratified super dry nails! (I didn't change polish / base / top / something in my diet, so I'm sure it's this stuff that destroyed my nails). Real horror came to me at the time when I took my pedicure polish off. Why did I sprayed my toe nails with this stuff? Didn't my polish lasted enough without it? It did last, but stupid me thought that nail prep must be good for my nails (this stuff has very high reviews on Amazon). My toe nails are ruined! They are extremely dry. I have never seen them in such a state before, but worse they are cracking! Never buy this thing, save your nails!